Comment-section borders: I agree that they’re currently on the faint side, and will darken them.
Intercom: Darkening the button should be easy enough, I’ll do that. The box that appears when you click it has enough custom styling from the library that it’s probably not worth the trouble, though it looks like people have made extensions for this (eg this one which I have not vetted or tested at all).
Comment-section borders: I agree that they’re currently on the faint side, and will darken them.
Intercom: Darkening the button should be easy enough, I’ll do that. The box that appears when you click it has enough custom styling from the library that it’s probably not worth the trouble, though it looks like people have made extensions for this (eg this one which I have not vetted or tested at all).