Weight difference between 28mm tyres and 32mm tyres are literally 100% irrelevant.
No, it's actually massive. given the excitement around light frames and the "oooo, that new one weighs 150g less, i should upgrade my frame", 28C vs 32C is a big deal weight wise. Technically, you also accelerate faster with a 28C, so if you're out of the saddle a lot and doing mostly punchy climbs, then light wheels feel nicer. I wrote FEEL nicer, as in reality, you probably wont be any faster. I did efforts on a climb with a 6kg bike vs my OEM disc bike and the light one felt i was superman. Result: no difference in time.
Last batch i measured, 228g vs 296g. One pair makes it a 136g difference. It's the difference between a frame from 3y ago and a frame today.
Why would you want big balloon 32s on such a light frame? Seems contradictory
In the mountains where i spend my summers, there are roads that are "dirty". Early in the season, they havent been cleaned, and there's loose gravel from the snow/ice wreaking havoc on asphalt. During the season, there's rain, and in the forest you can get all sorts of debris. Late in the season, you can have asphalt roads turn into gravel from massive mud runoffs, branches and all sorts of shit.
Basically on main roads, early in the season, wider is safer; on secondary roads, the kind of roads you want to do most of your riding because nobody likes traffic, wider is safer 100% of the time.
There's also less risk of puncture.
And what if you want to take the bike up vineyards and "tertiary" roads, ie roads that are barely roads? In Switzerland, between rows of vine, the access roads are often made with slabs on concrete put next to each other. With wide tyres, you dont care. With narrower ones, you do.