FSA is just a 30%-ish discount on medical expenses. It is useful for eye glasses and such. A lot of QoL services qualify for FSA, including weight loss coaches and therapy.
Heck my (prescription) meta ray bans were paid for in part with FSA funds.
You are I are both commenting on a subthread started by a comment that included "What you're describing isn't true for people on High Deductible Health Plans, and those plans are a bit of a racket because they're frequently paired with HSAs where [...]", none of which is true. I don't care about FSAs and am not trying to argue with anybody about them, but that preceding comment is very wrong about HSAs and HDHPs.
If you have a FSA I strongly suggest that you get an HSA instead.
https://www.fidelity.com/learning-center/smart-money/hsa-vs-...