I've seen nothing about an update to increase the number of stances. Two is there by design from what I can tell.
TBH - I've found I don't need more than two stances. When I find I'm having trouble with the two configured stances, I'll just make my way to a meditation point and switch them up, as needed.
I didn't have trouble difficulty-wise, the issue is that disabling 3/5 of the lightsaber made combat really boring, repetitive, and less fun than Fallen Order. Having to walk back to a save point to change to the other three was just an extra inconvenience and an immersion killer. They sacrificed what made their game stand out in favor of catering to a flavor-of-the-month subgenre. I can't believe it's been all this time and they still haven't patched it. If they do it in the 3rd game I'm just not going to get it.
@GunpeiYaBoiI get it. There's never going to be an update that changes this in Survivor I'd say, but I've had the idea that they can "hide" a "stance wheel" feature behind one of a few expressions of the next evolution of Cal's stasis powers, allowing him to "freeze" time as he ponders what lightsaber stance would be most beneficial, lol. This would be less awkward an evolution if they added further micro features like perfect evades giving like 2 seconds of Slow as a new skill, and/or a combo that allows you to freeze a single enemy immediately after perfect parrying them (separate from whatever next version of the Slow ability). Oops...just saw the date of this post...I've been away for a while...lol
