I miss stance dancing but I understand why people disliked it.
Perhaps it would've felt better if it was more designed as a reward for good tanking. FFXIV mitigation is, unfortunately, extremely straightforward and disconnected from everything else: push button, take less damage for x seconds. There is no real thought behind it.

I would prefer it if it was more dynamic and interactive and the dps stance was a reward for good tanking as in reacting particularly well to damage patterns.
You block a hit, now you can activate a skill within the next X s which gives you a very short buff (something like 3s) and if you take damage while the buff is up, you get a stronger damage reduction that offsets the one you lose from switching to dps stance while also increasing your damage in dps stance for a short while. The extremely short duration means you need to watch out for long casts and try to time it with the next auto/ raidwide going off but if executed well you get rewarded by taking the same damage as if in tank stance while benefitting from the dps increase of the dps stance and then you switch back.
On average it should be a dps gain over just blindly staying in dps stance because, say, you can't use the "after block" skill in dps stance. You can block but not use the skill.

You used a mitigation that lasts for 15s. For every hit you take during this time, you get one stack. Afterwards you can consume all stacks within x seconds to get the same benefit is above: damage reduction to offset the dps stance, slight additional dps gain in dps stance. So now it becomes important when exactly you use your mitigation instead of just "some time around x seconds so it gets the tankbuster". Timing it well rewards you with less damage taken from the additional hits that got mitigated (not interesting enough for most tanks to even try it) but also additional dps without any downside - and this should be interesting enough to work on mitigation timing. You get rewarded by thinking about your tank duty first.

These were examples from the top of my head, I'm sure others can come up with more polished examples but I hope it gets across what I mean by dps stance being a reward for good tanking instead of something that feels like it's going against the own role. I think damage should tie into your primary duty in the form of a reward instead of mitigation and dps being completely disconnected from each other.
Casual content doesn't require any of that so it would be perfectly fine to just chill in tank stance and pay no heed to it, there's no pressure to nail mitigating for some deeps gain.