I said very dangerous because it affects handling as the weight is shifted at the front of CoG of the bike, which in turn make the bike more sketchy to handle in descents or in a group ride. It also messes up with your body's biomechanics. We had a discussion with a Steve Hogg approved fitter that the reason why there's a lot of crashes lately is because of the saddle far too forward. There's now a UCI ruling that saddle setback should not exceed below 50mm.
"It's not felling timber or BASE jumping, you know?" - Well yes, but descending in 60kph - 80kph or even 100kph+ will cause you a lot of injuries too, or worse you even die.
If that's outdated for you, [url = https://www.youtube.com/watch?v=zqc2d2o0N-Y]this [/url]is a most recent discussion/podcast about saddle setback. Colby Pearce is the bike fitter for EF Education team, and he was also mentored by Steve Hogg. And as the title of the article said, it's for road bikes.
I actually tried to get my saddle as forward as possible and it just overloaded my hands and made them numb during rides. Yes, my pedaling is good but I feel that the balance is too forward that I can't ride with no hands. And i already have a 120mm handlebar length and very slammed stem. It was corrected by my fitter when he set my saddle a little bit back and I have the most comfortable position I had- cores are getting engaged and few to no pressure on hands when putting down some zone 2 power. In short, a very comfortable and sustainable position on the bike- one reason why on my next aero bike, I will request a comfortable position as possible without compromising the speed.
Still disagree with it. Newer bikes are getting longer wheelbases and front centers to acommodate the CoG shift. And if you have adequate core strength it shouldn't overload your hands. If it does, you need to work on core strength. Bike handling and descending are skill issues. Moving the saddle forward doesn't, or shouldn't, negatively affect the handling to the extent that it's dangerous. You're not that far forward where it should cause an issue. You can argue the safety of the supertuck, but with that you're putting your CoG way further forward than is even possible with the progressive fit.

Look how far forward Froome is. That CoG is at least 10-20cm (yes cm) further forward than I could ever get with my progressive fit. Saying that the progressive fit is unsafe or dangerous is just a skill issue on your part. With the saddle setback rule, you just can't shift your weight far enough forward to cause problems with handling.
I'm sorry but Hogg's thought about bike fit are simply just incorrect.
Also, the UCI rule is 0mm setback from BB, not 50mm anymore. Changed recently.