I'm not sure if it'll ever come back. I loved my Pixel 3 at 5.5" but nothing else for the past 5 years has come close. I eventually relented and got a Pixel 6a at 6.1"
It's relevant enough if you're concerned about RSI or CTS and such
In that case display size is a measure of how much strain you're putting on your hands to navigate the huge screen. A smaller screen means less reaching.
Also smaller display size means less content, less instagram posts, less twitter feed, less interest on your phone in general in my perspective
My S21 (6.2") is within a mm of my Pixel 3a (5.6") due to the reduction in bezel.