Why mark targets?

[Viridiana]

Honestly it's best not to read the replies, because the thread quickly devolved from "why should you mark", which was just a catchy title, to "all dps should dot absolutely everything all the time", which relies on some skewed math, the presumption that all targets dotted are going to survive for the entire duration of a dot, and other givens that don't reflect common dungeon conditions.

While I agree that the op's argument has almost nothing to do with his title, very few dots require their full duration in order to be efficient. Just throwing that out there.