[senko]

We could definitely see both use cases as valid. It's one of those questions that doesn't have a definitive right answer.

A trivial example off the top of my head, zoom-relative widths/sizes are super useful in mind mapping and similar activities where you want to "zoom in" (excuse the pun) to a sub-topic and "zoom-out" to see the overall picture. 1000x zoom is useless if your pen stroke is width of the screen.

A counter example is from GP.

We tried to listen to, but not blindly follow, what our (vocal) users were telling us. I'm stressing "vocal" here not because they were obnoxious - just cognizant of the fact that the silent majority is, well, silent. Hopefully the vocal ones are a good proxy, but that isn't always the case.