Processing power also plays a big part in next-gen upgrading. I'd love to play an open world game like GTA6 or Elder Scrolls with all loading times removed and nearly instantaneous rendering.It looks incredible there's no denying it but PS4 is fine to me I don't get why it's always gotta be moor moor moooooooor graphics. It's not that I won't buy a PS5 but only because it's the only way to play the new games that come out if they just kept PS4 for 10 more years I'd be perfectly fine.
Also get used to delays delays delays and 4-5 year development times.