As I learned when I was a child taking apart electronics, the hard part is reassembling them, haha. Taking photos of the disassembly steps can be helpful in remembering how the parts fit together.
Too many plastic enclosures are assemble-only, requiring destruction to disassemble.
The free market did a terrible job incentivizing disassembly... Can't count how many no-screw assemblies have triggered me.
The right-to-repair situation is a joke right now with automotive, consumer electronics, and appliances.
Assemblies with a lot of screws require manual labor, thereby increasing cost. I think what you actually mean is stuff that is specifically designed not to be serviced by being held together with glue, etc.