Sure, from a purely DPS perspective you'd be doing less damage per resource gained with a fast attack. But that's the point, slower attacks should have drastically increased DPS to counter the many pro's of a fast attack, since:
- there are resource spending skills where weapon damage is less important/irrelevant
- there are skills that benefit from amount of crits
- there are cc item mods that trigger based on hit
- there are (skill) procs that trigger based on hit
Anyways, it's true that relatively speaking one would gain less benefit from for example Sharpshooter when already attacking very fast, but generally speaking a faster attack is preferable to a slower attack, hence my statement that as a rule of thumb slower attacks should have more DPS.
So, i don't really understand what you're disagreeing with.