I mean, I'd much prefer to slice the troll in the jugular thus removing the threat rather than cower behind my dinky shield and await inevitable death or hope my DPS overlords would grace me with mercy and flick the troll away but to each their own.

I personally would prefer if tanks *did* do as much damage as DPS but with the caveat being that the DPS held the actual raid boosting abilities as to prevent the "dreaded" all tank parties and still retain their exclusive usefulness.
To illustrate it would be something like:
Tanks and DPS do 1000 dps ea.

A full tank party does 6000(6 tanks)
But a full proper party does 12,000 (2 tanks 4 DPS) through various buffing, debuffing or even new mechanics like destroying certain boss parts in the rear and/or flank that causes a state of temporary vulnerability.

This would enable tanks (and maybe even healers) to participate *equally* in contributing in the winning metric(killing the enemy) rather than only play with the prevention of loss which has no real room to excel in(mitigation and healing). But I don't know, maybe people just simply want to feel more powerful than someone else rather than feel like they're working in a team (Selfish DPS classes /vomit) so there's always a constant demand that DPS do 20x big numbers while tanks and healers play in the kiddie pool with their pool noodles and can only support the chad DPS who constantly wonder why their queues are so long and no one is playing these support roles. Tanks and healers adjust. /shrug

But tangent aside, rather than removal of Tank Stances, I am of the side that Tank Stances should instead be changed to accommodate a non punishing play style dependent on the situation. And to go further on that, I feel that all Passive Cooldowns like Rampart or it's ilk should be replaced with the magnificent concept that is The Blackest Night. Effective mitigation that rewards with more damage. (Ofcourse Bloodspiller should be buffed so that it is an actual gain from TBN rather than being a loss or at best DPS neutral but that's beside the point)

This should allow tanks to acquire a skill ceiling that is relevant to their suggested priorities: mitigation and give the player a tangible reward for excellent execution(more damage = more winning). One easy to digest goal and progression. Unga bunga me defend good, me attack/reflect better!

But at the end of the day I can understand the necessary evil that a tank stance provides because as binary as survival is, it does have a huge raid wiping consequence and as with their design philosophy with Stormblood of lowering the skill floor, especially if Billy 1-2-3 Tank stance spam is also a target audience, tanks just need to brain dead for the sake of everyone else that isn't the tank player.