I know Genshin is the first gacha game for some, so you are maybe feeling incredulous at how OP Ganyu is compared to previous characters. I'll admit it surprised even me how good she is.
This is par for the course in gacha games. Mihoyo clearly tried to avoid it a bit to begin with, but power creep is a de facto requirement in a gacha game for it to keep existing, otherwise what motivation would whales and even cheaper players have to continue pulling new characters? Why pull new pyro main DPS 5* if Diluc and Klee are better than everyone else forever?
Get used to this. There is more to come. I'd expect Xiao, Hu tao, etc. to probably all be at least a noticeable step up in DPS compared to most existing 5* DPS. Then that will be the new norm for a while. Then there will be another round of power spikes.....it is inevitable. Eventually C6 Diluc will be a joke sitting the bench next to Amber.
No he's okay. He just kicked ass on Double Dragon.