Yeah, the only case where frame gen makes sense is when you care more about smooth motion than responsiveness, and you’re willing to pay for it with the inherent artifacting.
Games (and TVs) have gotten a lot better at latency compared to the 100+ms PS3 days, so it wouldn’t phase me if someone with a ultra high refresh rate monitor says they prefer having it on because of how smooth it is, but there are big drawbacks.