The ping / ms thing is a lie i feel. Many games i’ve played in rank as a UK player i’ve met Full teams of US players, this is mostly in the evenings / night as its when i can play.
The difference is very noticeable, as being shot though walls, melee not hitting, 4 shots turning into 6, ext.
This was an issue in MCC as well until you could select ur region filter and it fixed it. Playing ranked without knowing if ur going to be in a US game or not is really annoying tbh.