How to describe someone who doesn't act because of their perceived comfortable situation?
Solution 1:
The following idiomatic expression can be used to convey the idea you want to express:
rest on your laurels
to be satisfied with your achievements an not to make an effort to do anything else.
(Cambridge Dictionary)
- The X App has a serious problem of user experience that could be greatly improved with a few simple features, but they are resting on their laurels and we'll never see those things implemented.