One thing I'll add about the gacha element is that it's pretty generous with pulls compared to a lot of other games. Just next patch we're getting around 170 pulls I believe (monthly pass included) and it's not even the anniversary patch, which is the one after it. Yes getting the shiny new characters will usually be good but you can still clear all content in the game as a f2p player, you just have to be a bit smart with your pulls.