Good design respects what it leaves untouched.

A lot of design is restraint about what not to alter. The existing light, the old wall, the way people already move through a space, the thing the user already knows how to do. Adding everywhere is easier than knowing where to leave alone, and it is why so much redesign makes things worse.

Before you change something that is working, ask what it is currently doing well. Protect that explicitly. Improvement that ignores what was already right is just a differently shaped problem.