But why? Why craft swords, axes, armor, etc. that are normal at all? To make more junk that doesn't sell for much?

I agree with those who say the only worthwhile items to craft are items like Sussur weapons or Adamantine or whatever. All the crafting you can do with spoons, knives, forks, plates, cups, etc. would be boring junk items you probably won't ever actually use. You'd just sell them.

So why not cut out the useless junk in the game and just have useful items, more gold, rather than collect and sell useless junk, and so forth?

At least make all the useless stuff things I'd actually have to pick up on a table or shelf, not within lootable inventories.

Right now, if an enemy has even one useless item, like a bone, I have to either take it with good stuff, with Take All, or I take each item I want one item at a time. So, my inventory winds up filling up with garbage I just sell, one item at a time, because it's just easier to Take All.