Interesting! My thought was more that it was just dragging some heavy line kind of keeping things straight and boring. I'll correct.

I think that your usage was actually correct- if I understand correctly, choosing to use Mac's native keychain is kind of "going along with" what Apple prefers- is that the sense of what you were saying? If so then you could definitely say apps "toe the line" when they do this.

It was just the spelling I was pedant-ing about!