Why do we need so many muscles in our hands, wrists, and arms?

Because, without them we wouldn't be able to do many things like play football, tennis,Etc. The point s that we would be less fun.

Hi there

In my opinion,I would say because we need them as a power.
We used our muscles to do things such as playing sports, writing, etc..
I think everything you are doing you would need to use your muscle.