The usual justification for a humanoid form factor is the idea of fitting into a world designed for humans. But even if the world doesn't, itself, change* does that really lead to a humanoid? Surely we might like to have added eyes in the back of our heads.** And there are plenty of times I could use a third or fourth arm and hand. And, rather than holding tools why not plug and unplug various sorts of "hands?" And legs*** are good for uneven "ground", stairs, etc. but wheels are more efficient otherwise. etc. etc. etc. the list goes on.
* And that's a big if, see, for example, my blog of 10 April 2024.
** why have "heads" for that matter?
*** two legs? four?