Lore
I started playing less than a month ago. I find the game mostly boring and repetitive if you don't have money to spend, but the alliances and community is great and mostly why I play everyday lol.
It's hard to gain strength without buying a few things here and there but I understand games like these are cash grabs without much effort behind them.
Still, I wish the devs would actually put some effort into the story behind the game.
At the beginning you think "Okay, I'm a doctor now, I have to cure people, and oh, Celia is going to be a main character, what's her story? Where did she came from?" and then...nothing. Once you finish the main part, there's nothing else in the game.
You don't get introductions for new characters, nor their backstory, no lore, no storytelling whatsoever. I recently discovered there were more characters you could unlock and still there's no info on them.
Maybe it's my bad for getting used to Genshin Impact type of games, but yeah. I wish the game was more deep and not so plain.