The Samsung Galaxy S8 earns a 4 out of 10 on our repairability scale (10 is the easiest to repair):

Lots of components are modular and can be replaced independently.

The battery can be replaced, but tough adhesive and a glued-on rear panel make it unnecessarily difficult.

Front and back glass make for double the crackability, and strong adhesive on both makes it tough to access the internals for any repair.

Because of the curved screen, replacing the front glass without destroying the display is extremely difficult.