what about new carry items do you think have supports more peel? What about anything have supports more peel?
Support picks are probably indeed part of the reason; Braum, Thresh, Leona and Morgana, which are by far the 4 most picked are able to stop anyone's aggression and turn it onto you if you're alone. They are all mechanically easy and extremely punishing.
Otherwise, I must agree that I also feel bot lane snowballs harder than before, but I can't quite grasp why. I'll go on a limb and say that it's because of the BT rework. Basically, once the enemy carry gets ahead, in the best case scenario he'll have a BFS to your pickaxe (orBFS+pick to BFS). The early item build is pretty much set in stone, since early BT is said to be terrible (I never understood ADC itemization, all I know is that a flat shiv rush feels bad). On top of that, IE gives more actual combat boost than the old (scaling) BT, which makes that first chasm wider.
It is possible that this dominant meta is a counter to champs like Master Yi and other low utility melee champions.
If only it was so. The rise of Thresh/Braum/Leona is extremely easy to explain : they're better than others (for Braum I didn't follow his last series of nerf, he may be slightly more in line now). The rise of Morgana is because although she isn't much better than others (still better than average imo) she directly counters the FotM. Then, you have Nami who can be picked as a soft-Morgana.
Have you considered trying out a champ with a strong ranged initiate, like Fizz with his E or even Olaf who could just ignore the peel cc and build thornmail?
Olaf + Thornmail will still struggle killing an ADC that's covered by Braum/Thresh/Morgana, and Leona + ADC can probably still kill you faster than you kill them.Similarly, while Fizz seems like a good choice at first, we're into a meta of tanky junglers because of the huge presence of CC. You have to be able to go upfront and take some targeted damage, otherwise your Support/ADC/mid is dead.
The biggest difference is that I feel like nothing is lost right now. Yes, 2v2 the bot lane snowballs harder than before, but you can still gank it quite easily until it's 4/0 or more (which usually comes after a couple minutes of warnings).