Sony was way ahead of its time when it came to remote play. They first did it on PSP a long time ago, but it was rather half-baked. Remote play fared better on Vita as all games from PS4 had to be supported, but the underlying networking tech available at that time was not very robust, hence the experience left a lot to be desired.
However, with the advent of the likes of WiFi 6, and the fact that modern smartphones and tablets accompany some incredibly high-end tech, I believe this is the right time for Sony to refocus on remote play with PS5, especially with integration of PSNow to make the experience available everywhere you go.
If remote play is made just as convenient as the share button made capturing photos/videos, then in a way it would feel like an inverse Nintendo Switch. I mean Switch is primarily an underclocked ARM/Tegra-based handheld with a convenient and easy to use secondary function of connecting it to a TV which allows the system to cloak higher compared to its handheld mode. In a similar way, A robust remote play can make PS5 (which's primarily a high-end console) to easily project a screen to any of your other portable displays that you can take anywhere in the home and outside (and that would be its secondary function).
Innovations in such areas are what I am hoping to see with PS5, not just a higher spec bumps alone.