I have had one of these for about 3 years.

The front strap pockets are super convenient for carrying a phone on one side and a couple snacks/plug kit in the other.  Its not obnoxiously large but it carries a pretty good amount of stuff and you can fold up discarded layers or pick up trail finds in the mesh net that folds up into the hideaway pocket on the back bottom). 

https://www.aliexpress.us/item/3256803211756372.html

For everyday riding and potentially getting done at night;
Trustfire D2R - gopro style mount, cheap, bright enough.  I keep an extra in my pocket sometimes just in case as they are small and easy to swap while moving. Its light enough I never worry about it being mounted below my bike computer on an out front mount.
https://www.aliexpress.us/item/3256806529223121.html

If I know i'm going to be all alone or out in the dark for hours;
5 led, 8000mah light bar - Its not 5200lm, but its nearly on par with big outbound lights at 10% of the price.   (I use this light bar for the weekly night time MTB group rides mostly, but it works great on the yearly night time gravel race i attend as well) Low beam is slightly brighter than my trustfire light and it will run most of the night on that, I just flip it between high and low depending on group position/traffic on gravel/road)  I actually have 3 of these, 2 of the biggest and one of the smallest.
https://www.aliexpress.us/item/3256806810431448.html

I never felt a need for a helmet light on gravel,  on MTB or racing motorcyles, they are very important due to steep terrain, turns, and speeds.
This is the helmet light I use currently for MTB,  It's kind of heavy, but I haven't found anything cheap with a remote/wired battery that doesn't disappear in the wake of my light bar.
https://www.aliexpress.us/item/3256808935404280.html
(This would probably be a great bar mounted light on a gravel bike, its got a gopro mount and a remote button) 

I made an imgur post of all the cheap lights i've used over the years because I see this question so often; https://imgur.com/a/cheap-lights-that-work-81mEKUh

I actually just ordered a Thumper Jockey Viking helmet light.  It's been floating around $150 for years but recently dropped to $70.  Its 4000Lm and has a wired battery.  I don't particularly like being tethered but I had to give it a shot, maybe it won't disappear in the wake of my bicycle light bar.  I'm sure it will still disappear against my motorcycle light bar,  but that is a 12" 6200Lm bar that I can barely outrun at 60-70mph in the desert.
https://www.thumperjockey.com/#!/Viking-Helmet-Light/p/556764418

https://www.aliexpress.us/item/3256806817868438.html

i haven't had a problem with hookless, but i'm a 125lb, cat 3, xc racer...  so ymmv,  but i do only run 15.5psi F/ 16.5psi R and no liners...

Buddy of mine has some Elites he likes.    I grabbed some Serenade wheels 5 or 6 months ago and have been beating them up pretty good in the chunk without any issue whatsoever,  $615 to my door, 1125g, 30m iw. https://serenadebikes.net/Ultralight-Asymmetrical-Mountain-Bike-Wheels-30mm-Internal-Width-22mm-Depth-Rims-With-m270-Boost-Hub-p6805953.html   They were a little more than the Elite, but i wanted super light, and dealing direct with the company seemed nice.

There's a thread over in the mtb section about xc wheels too... https://chinertown.com/index.php/topic,6085.0.html

Are there any summer jersey with higher quality / more "technical" fabrics similar to the likes of Attaquer, MAAP, etc?

I seriously feel like the Ali bibs (I really like Hiserwa) are quite close to some mid- to high range brands as long as they have EI chamois.
The jerseys I've tried (Spexcel, ykyw), while they fit OK, the quality of fabric is just so bad in summer jerseys. Stretchy, sweaty, drapes horribly and loose pockets. I will say some of the long sleeve and "winter" ones are way better but the summer ones are no where near IMO!

Can anyone prove me wrong please?!

I've really been impressed with these two jerseys I got this past fall and have been wearing a lot lately.

random shop, "concept speed"
https://www.aliexpress.us/item/3256809282000132.html

BCBE, I have some bibs and socks from them that I really like as well.
https://www.aliexpress.us/item/3256807461408292.html
BCBE seems to be rebadging other products maybe?

Update: I yolo'ed and bought a pair. Very flexy and too small, even though their sizing chart says I should be at the bottom of the range for the size I bought. Not recommended.

Thank you for your sacrifice.   I've been curious on these since they are so much cheaper than Bont; but I've been waiting for an SPD version to pop up since I almost never use SPD-SL.

The flex, do you think its a too thin layer of carbon for the sole?    Is it sort of flexible like a pair of aliex or low end western bran plastic soled road shoe, the kind of flex you notice on sprints and really far into rides? Or is it notably flexible all the time like a MTB flat (which is really stiff compared to regular shoes, but definitely not as stiff as a race oriented shoe).

Do you think it would it be possible for something like an extra footbed shank to stiffen it up?  I use a 1mm carbon insole in some flat shoes and they significantly stiffen them. https://www.aliexpress.us/item/3256807149370236.html

I grabbed a micro PC a couple years ago to use with MyWhoosh.  It runs fine.  It was like $300 and is the size of a mcdonalds hamburger.

Try Samox. They have some carbon MTB cranks that are available in 145-155-160-165-170.

https://samox.com/product/platinum-tm-1/ 
These have a 168 Q-Factor, their DH have a 183mm Q. 

I've also been lookin for short MTB cranksets that use the 3bolt GXP chainring mounting style and have been coming up pretty short on cheap options (and I'm not even looking for carbon)   Plenty of short aluminum cranks on AliExpress, but their spindles aren't long enough for a Boost setup by my math.  If anyone has any recommendations, let know.