I have! For a few years actually. I find that many chain studios don’t teach “true” barre technique, your mileage may vary.
I’ve taken barre classes upwards of 5x a week in NYC, DC and LA - some at “major chains” and some at more boutique studios.
Fundamentals of barre if done correctly include ~60% external rotation as one does in classical ballet, which I did from ages 5 to 12ish (I have an ankle deformity and en pointe was just going to lead to way too many injuries and an “ugly leg” - my then teachers said “shame, you have all of the look and one of the erm… grace needed for the lines of the leg” I quit shortly thereafter)
Pure Barre the chain teaches their own brand of barre which is IMO very very different than other barre methods.
(I don’t like it as much as I find it less of a practice and more of a catch all low impact exercise that appeals to the masses). BUT that is why some people like it – it’s not for me likely bc of my early dance experience and my preference for classical reformer pilates
…Pure Barre has the LEAST focus on external rotation - so a good option if you’ve not got others!
Exercise is great - some is better than none
I personally don’t love doing types that undo progress in others - at 25 I had more malleability in my body to go from one “extreme” to the other. I’d do CrossFit to ocean swimming/surfing to pilates to barre to riding to running marathons (all in the same week / within 14 week cycle) …
At 34 … I just don’t do that workout schedule anymore so bad habits from other activities creep into my form - a function of age or function of focus … idk!