Pre poker boom and early boom, the standard 3-bet size against one opponent was 3x raise, with a lot of variation in sizings. A few years ago very small sizings were standard with sometimes click it back 4 and 5 bets, folding to another click it back often. I notice that sizings have gone back up, with 3x more standard an 4x OOP. Is that because with solvers people have realized you can play hands without initiative, and they are flatting a lot more? Are there practical or theoretical reasons for the change or is it just fashion like oscillating clothing styles?