The difference between the games (ffrk and feh) is in ffrk we know what's coming next and can plan accordingly- even in JP they have a sneak peak before the banners drop. Here every two weeks is a mystery of what we're getting, the only certainty is a hero fest banner every three months.
I'm not salty but this feels like a pay to play TT where every bonus unit is on a fresh banner (excluding Arvis).
That said Ayra is a permanent unit, so it's not that bad.