My minimum is 150 PPI (which is ~ 4k @ 28"). If I wasn't so cheap I'd probably just get the LG ultrafine/Apple studio display, but might compromise and get a 5k2k 34".
I’m not doing a bunch of photo, video, or design work where I need the pixels to vanish, and while I’ve never looked for pixels, I’ve never noticed them either. The screen isn’t nearly as sharp as on my MacBook Pro, but I don’t need it to be.
Being able to make a window tall or wide (or both) without having to have a complicated monitor setup and move windows around is very nice. I use both of these options on a daily basis and can’t imagine being without them now.
My only issue is that when I share my screen I need to use the laptop display, so people can actually read what I’m showing. When I do that everything feels very cramped and I can’t see much at once. I honestly don’t know how people live with small screens.
I think if I want to up the PPI, I would have to start looking for an 8K display. Maybe once they come down in price that will be in my future. This actually gives me a reason to pay attention to that market, because as a television, sitting 10+ feet away, I don’t see much of a point to 8K.