Spider-Man Aesthetics

I admit I don't read Spider-Man at all. There have been a few arcs that have interested me but that’s it. I don’t have anything bad to say about the character himself; I think he’s pretty original, but he’s just never done it for me. But there is something I don't understand that happens with him sometimes:

Why does Spider-Man look like an anorexic teenager wearing pajamas?

Yes, it depends on the artist and some draw him in the more classic style, but some draw him like a scrawny teenager picked off the street and thrown in a costume. I don't get it.

I know Parker was a teen when he became a super hero but I’m pretty sure he’s not a teen any longer. His body has developed and he’s actually filled out with muscles, and super strength is a part of his power set. So why is he drawn like he hasn’t eaten anything in months? I get he’s not supposed to be muscle-bound like Thor or Luke Cage, but there is no reason for him to look like he’s skin and bones.

Also, why do some artists draw the outlines of his feet through his costume as if the feet have no soles? Seeing his toes is awkward and honestly a bit goofy.

So when the editors at Marvel get the layouts from the artist, don't they see it and say to themselves “that looks weird?” I know I would. I’m not saying you should tell an artist his style per se, some will draw characters bigger, some smaller, but I think when it goes into the realm of making him look like Dr. Strange could pick Spider-Man over his head and break him like a twig, I think the editor needs to step in.