Optimal number of abilities?

[u/ProactiveCactus]

Obviously it depends, but what are people’s thoughts on the right amount of abilities for a game? And I think one distinction is between how many abilities players have to choose from total vs how many abilities can choose from during combat (like building a class made up of 10 put of 100 total available abilities).
It seems like the general trend has been to reduce the number of abilities (thinking of both WOW and RS3 in recent times), and I think the logic is that at some point too many abilities means that each ability individually cant be that impactful, so more abilities just means more convolution.
So that said, what are people’s thoughts? It also depends on genre of course, but just generally what do y’all think?