Not if you're writing a library/framework that other people use though.

If all you do is consume other people's library/frameworks then yeah, nothing really matters, do whatever you want, refactor at will.

Yeah, that's kind of my point. I agree that api design is important if you're publishing a library, even for internal use - that's why I said "in a single project".

It seems to me that a lot of people obsess a bit too much about this stuff in places where it doesn't matter.