It can help with image clarity on higher Hz LCD displays. As they get tangible benefits to having higher Hz to display. But that doesn't apply to OLED, which has the same pixel response/refresh speed regardless of what the Hz are. And the extra clarity on LCD's with high Hz... is not necessarily as beneficial outside of MP... where you wouldn't really want to use FrameGen to start with. Not to mention the artifacting that comes with FrameGeneration as well.Overall this gen is looking to be pretty unimpressive. Right now it looks like the 5090 is the only card that is getting a substantial performance uplift, but it's also getting a price increase. 5080 isn't looking like it will even match the 4090.
I'm not impressed with frame gen stuff. I tried using it with 40 series and found it very underwhelming. It didn't help with latency if you were at low frame rates, and if you were upwards of 100 fps then the experience was already smooth enough so it didn't do anything there either, so there was a very small window of like 70-90 fps where it even did anything beneficial.
Adding more generated frames is also completely unnecessary. You already get the smoothing effect with a single generated frame in the range where it does anything. For multiple generated frames to be beneficial you'd have to be running at like 30-40 fps, in which case the experience is going to be horrible regardless of any "Reflex" stuff.