Screws are the king of parts count, manufacturing process (for the screw itself, and it's nut, as well as then using the screw), and falling apart later.

Having the thing be held together by screws is not necessarily the problem, it's having so many instead of having interlocking pieces that need only a couple screws, or maybe none.

The alternative doesn't have to be glue or rivets or welding, just folds and tabs and slots.

And some amount of welding or rivets isn't necessarily anti-repair either, it just depends what, where, & why.