Sure, it's down to the individual. But like SD tv doesn't look as good as HD, and once you see 4K....
Using a 5K iMac has spoiled me and lesser computer screens don't look as good, like my 2K Ultrawide monitor which looks blurred now.
Using a 401ppi screen on the 7plus means text etc, looks sharp. With the 828p, 326ppi display on the 11 I can see the pixels, especially on text. The taller and narrower display is less appealing for reading on as well but I know many are happy enough. It's just for me, the XR and 11 feels like a downgrade in screen quality with regards to sharpness. I could butt heads with others all day about this, like those that don't see the jelly scroll on the ipad Mini 6, but there's no point as it's personal choice. I'd be much happier if PWM didn't affect me or I wasn't able to see the difference in PPI 🤷♂️Ted