Depends on the game and how I am playing it. 

VR Game: Too low, 90 fps is the lowest I am happy with, 120hz is ideal. 

Racing, Fighter, Shooter, Action games in general, etc: 60fps is fine, but a minimum.

Slower turn-based RPGs, slower paced action-adventure games, etc: 30fps is fine, but a minimum. 

In some games it gets too hot (98c) and thermal throttled which causes severe stutters, hence I disable turbo for FH4 and FS2020. Testing ori right now temp stays in the high 70s / low 80s with turbo enabled, so not as taxing. However now I'm paying closer attention to it, it's not smooth while running either, lot of very noticeable judder, even when jumping (flying through the air) so scroll speed should be constant. It's very distracting.

My CPU does go up to 3.8 ghz while Ori runs. I see no other settings, just resolution, set to 1080p, full screen, motion blur off, VSync on. Without Vsync the judders are less, but still no constant scroll speed. More playable anyway, but I need to start over I see. No clue what I'm doing anymore, running back and forth in the same area.

No clue how to change the other settings (hyperthreading, affinity)

Well because "anything but 60 FPS is unplayable" (not always worded exactly like that but the same geist) gets thrown around I think my original analogy fits better. 

OK I guess you are right, PC players usually say that, even 120fps sometimes.

Yep, I see those a lot on the FS2020 forums. Less than 60 is unplayable and they (say they) won't play until they can get stable 60fps or more. A new sim update just came out, I wonder how many people are studying their FPS counters again, more than paying attention to where they are flying :p

It very much depends on the game

For action and racing games 60FPS are a must, but for any turn-based game like civilization, the fps are pretty close to meaningless

Its more important to me than 30 fps.

I'll put it this way. I will generally accept lower resolution and visual tweaks for 60 fps.

It's annoying me right now. I'm considering holding off playing my current ps4 games and waiting till I can get a ps5, because I'm picking up on the less responsive 30fps. I just finished playing sekiro and re8 and told myself during the game, I wish this was 60fps. Now i'm playing through kingdom heart 3, and although the gameplay is hectic and beautiful, I can tell it's running in 30fps and can imagine a better smoother experience in 60fps. Once you experience 60fps there is no going back.

Perfect experiment for those in doubt, load up tlou1 remastered, swith 30 fps mode, play for a minute, then switch back to 60fps,play, revert back. The difference is night and day.

Now I have to try play through 30fps.. Sux I can't find a damm ps5.

I did that on my projector, switched back and forth a couple times, then stuck to 30fps mode with better shadow quality...

While I understand the reasoning behind it, it does feel strange when you're playing a game one a modern HDTV and it looks far worse. There's this moment of weird disconnect where you're like, wait... why did we think liquid displays were better again? When a TV that was manufactured in 1999 looks and performs better than a TV made in 2021, something is wrong. Clearly, the people designing these things didn't take any of this into consideration.