To be fair, lots of human artists cant either, or fucking hate doing scenes with complex finger work, or drawing precise hands in scenes where the hands arent really the focus.
There are reasons why exasperated anime characters hands just turn into balls when they flail about.
Even a lot of video games for a very long time just used something like mitten hands in a lot of cases.
Some models are getting better, but it's still a point of difficulty. There are a lot of valid ways for fingers to be, so "finger like" areas have a lot of valid ways to be drawn. You need a fair bit of context to be able to say "wait, this is far too many, and the angles are all over the place".
They also seem to do less well when more detail needs to be given to other areas.
Some images from a model that tried to do better at hands, and a prompt that pushes it to focus in the hands: