The low level roulette is for whatever you make it for. As much of a cop-out answer as that is, that's exactly what it is.
-> I used it early on to help me make gil back when I was poor.
-> I used it to get Tomes back when I needed tomes (Before being constantly content-capped)
-> I used it to get EXP on jobs back when I was leveling.
No, it's not designed purely for the "Low level players", otherwise you wouldnt' see rewards on it for high level players. It is designed for everyone, not just one specific class of player.
And those same DPS will not hold back for any tank. And those same DPS will pull threat, regardless of the amount of skills they have. That is my point regarding this - limiting our bars only serves to inconvenience us and makes many of us who WOULD go help people out... not bother. Like myself. Because I dont' enjoy 3 button gameplay.2) A majority of DPS I have met couldnt give 2 damneds about their threat generation and didnt even know the white bars on the party bar was even threat orientated til pointed out.
Most BLM's I meet learn fast that they need Quelling Strikes due ot the high initial burst phase of Astral Fire. I've seen even the most stubborn of BLM's finally concede that having a threat reduction abiility so they don't pull threat is far more beneficial than ignoring it. So this is kinda YMMV sort of deal - we both have different experiences iwht DPS, it's impossible to say which is the majority.3) Again it comes down to they want to get through fast a majority of mages don't even use Quelling Strikes.
What's stopping me from doing that right now? Absolutely nothing. The only thing "Stopping" me is that I'm a decent human being. Horrid people will be horrid. Matter of fact, I've actually been kicked from low level "Because we were trying to get my friend in." after waiting 20 minutes in que... NOTHING will change people wanting to get their friend in.4) So whats stopping you kicking the newbie tank who doesn't have access to Shield Oath yet so you can get your buddy in to blast through the dungeon?
We'll have to agree to disagree. There are plenty of PUG's and Stranger's I meet that can do things just fine. For example, Steps of Faith, one of people's favorite comparisons, I did easily with plenty of PUG's in duty finder on day one as well as 5 days before the Nerf patch (I love doing me some trial roulette, even if I considered stopping doing it because it got to be annoying) by communication.5) I disagree going faster and trying to do things faster than the mechanics with strangers will never be a thing you can accomplish with strangers but only a premade party.
Matter of fact, when I used to take my scholar into low level roulette, if I got Halatali, I would say "Hey everyone, focus on the boss. I can take care of adds by myself."
Communication is a hell of a thing.