I think you will find that 4K is generally sufficient at 32". Text is sharp enough, and a high refresh rate is probably more important at that point. There is also the issue that not even a 5090 can push enough fps at resolutions higher than 4K in demanding games.
4k stretched to 32 is awful. screen door very visible. honestly it’s not even quite enough for 27.
Oh to be young again. I use a 43" Samsung TV at 4K. That works for me. The 32" 4K monitor next to it I run at 2560x1440, you know, so I can read it...
If you use a 27" 5K iMac its impossible to go to 32" at 4K. It looks terrible.
I have 4K at 32". It's pretty sharp but at 6K the pixels would be significantly less visible, and I could run it at an even 200% so that older programs don't have scaling issues.
And I don't need to run games at full resolution.
6K at 32" would be the same density as 5K at 27"