I just upgraded from the 6a to 7 solely for screen brightness. In the sunny southwest I couldn't read the 6a while driving wearing sunglasses even on max brightness. The 7 gets much brighter, reportedly brighter than the 6 as well. But even the 7 doesn't match the old Samsung A71 5G screen.
7's wireless charging is a nice to have, but with GrapheneOS's 2 day battery life, I had zero "charger anxiety" on the 6a.
Personally I have never used 4 GB of RAM, much less 6 or 8 GB on any Android phone even with loads of apps and browser tabs open. For privacy/security I try to keep any apps I'm not actually using closed.