It’s possible they may add Gladiator Stance. They clearly adding various abilities for the Runes from other iterations of the game. So it would stand to reason that might happen at some point.
I never played when gladiator stance was in the game but I dont mind stance dancing. Just feels weird for my main ability to not work in the other stances. in classic MS, Bloodthirst, and Shield Slam functioned in all stances so I guess I dont understand why they felt these caveats were necessary. Pretty sure devastate worked in all stances in its original iterations as well