@Ronnie21093 alrighty. Here's my specialty.
Okay so when global came out it was moving at a normal pace. After a while they decided to sync the servers and so they started rushing out content and skipping less desirable banners and events, players were mad that they had less cubes because they got less events and JP players didn't like the idea of global getting anything they don't, they then decided randomly that "nah we aren't synching the servers" and started droping the banners and events they skipped, Jo then went into anniversary, and released a movie limited unit, global for some reason decided to drop the limited summon at the same (or at least a lot earlier than planned) in global. Jp got their Anni and shortly after global got the same Anni summons despite not being synced.
After anniversary they proceeded to dead air global and drop events and banners at an inconsistent and incredibly slower rate, probably to allow up more room from global.
So now we have global players that know how much Japanese players are getting and what cool celebrations they are receiving during large gaps of basically no content.
This is made worse because players also can't count on the banners to come at the same pace because of them randomly dropping shared banners or events.
It seems to be getting back into a proper flow but they jumped the shark with the will they won't they sync up.
Overall it's just kinda the inconsistent nature of how global was handling content and events that led to frustration amongst the playerbase.