I've never been bitten by an interface that is too simple.
I've never had a bug in code that I didn't need to write.
Don't try to solve future problems. You'll have the problem that the problem you solved isn't the problem that needs solving, and then the problem that needs solving.
If anything, overly simplistic solutions sometimes make me feel like I'm repeating myself, but really since the code is so easy it always feels possible to refactor it. That's a good place to be, much better than afraid to change something because it's too generic to know if you'll break something.
Everyone has an opinion on an interface that is easy to understand, and not over-engineered (bikeshedding).
Don't try to solve future problems. You'll have the problem that the problem you solved isn't the problem that needs solving, and then the problem that needs solving.
If anything, overly simplistic solutions sometimes make me feel like I'm repeating myself, but really since the code is so easy it always feels possible to refactor it. That's a good place to be, much better than afraid to change something because it's too generic to know if you'll break something.
Everyone has an opinion on an interface that is easy to understand, and not over-engineered (bikeshedding).