Also what's your example of other classes having difficulty with active/passive skill synergy? I'm trying to think of one but I'm coming up short.
The best I can do off the top of my head is Magic Weapon for the wizard. It was debated how/when its damage buff was applied. Will it increase melee damage only or will it increase spell damage too?
Archon for the wizard. I bet most people couldn't tell you what skills the Archon has besides Disintegrate (if it's even called that in Archon form).
However, this is more about how a monk can fill several roles, and not necessarily how a monk would have several ways to fill these roles
let's look at survivability on the monk for a second. Just about every skill (offensive and defensive), when runed, has a viable
way to increase the Monks survivability. It allows the Monk to have no cookie cutter build (or at least a lot more of them) because there are so many skills that overlap on what they do while still being unique from each other.
The Barbarian is a melee class so he is pretty much forced to take some of those life gain skills if he wants to survive in end game. The same is true for the Monk except for that the monk can tack on defensive things onto pretty much any skill he wants while the Barbarian in limited to a few skills that do it sufficiently.
The Demon Hunter fills the role of ranged dps and... that's about it. The DH doesn't really have many/good life gain attacks. It doesn't have many team support skills. The DH's survivability comes mostly from its mobility and that's something the Monk also has. The Monk can't do it as well but it does it at end-game sufficient levels.
the monk can tank, heal, and dishout fairly impressive damage...possibly in the same build depending on what you're trying to do
This is spot on on what I'm saying.
(the only archetype that the monk fails to grasp is ranged)
I agree with you, although it's a stretch, Deadly Reach somewhat covers this/makes up for it. The character is just almost flawlessly well rounded. He may not be able to be a ranged dps but the monk has multiple skills of closing the gap or even increasing it.