[ryandrake]

What makes that reasonable? I can open and repair pretty much any other electronic device in my house if I need to. What makes a phone special?

[afiori]

you can, but many of those repair can be delicate and require specialized equipment.

The difference between the 2 requirements is the level of technical knowledge needed and the necessary investment in tools

[make3]

are the other devices waterproof

[ryandrake]

Some of them are.