I think DPS queues aren't as bad as they could be. At least thinking back to when I got bored of questing on WoW with my Warlock and wanted to try levelling through dungeons and gave up because the queues were so damn long.

But I get there can be a disincentive to tank when there is a wall. The way I think of it, dungeons like Satasha are so forgiving that it leaves room for people to practice without it being detrimental. I don't like DPS who pull either because I feel the tank should control the pace of what they and the healer can handle. Fortunately I know how to tank well enough for that to not be an issue for me, but I can appreciate how it is for people learning or are new, that it can be more frustration.

At the end of the day the tank & healer know their level of experience. But I feel sometimes the best thing you can do maybe at the start is to say "first time tanking" or "hi I'm a new tank" and maybe add a cheeky "please go easy on me". I've seen people do it and generally I find myself watching them more to pace myself or help them if there's a problem. EG: if I'm a DPS and I see a mob attacking the healer, I attack that mob, get aggro and pull it to the tank or even offer advice if I spot something that might help them.