You seem to be quite the expert. Shame no devs have the resources to change a few sliders while releasing pro patches for the new pro console.
The Alan wake rendering enhancements must be by accident.
No, I'm not an expert, but seemingly know a lot more than you.
Your problem is you inherently think this is just a matter of sliders, but it isn't.
The biggest question you have to ask is whether you want to implement PSSR over existing reconstruction and then you have to adjust from there. You have to find out what native resolution you want to input into PSSR and how that output looks. PSSR still has a cost to it, so a lot of that extra horsepower you're getting on the PS5 Pro's rendering is going to go into that.
You also have to decide whether you want to improve visuals and to what degree.
And then you need to QA all of it.
That all takes time and resources. The more aggressive you want to go with it the better the result, but the more the resources are needed.
Look at Square Enix and FF7 Rebirth. First they have a large amount of resources, they don't have a single major game releasing anytime soon, nothing even on the radar. Where is Dragon Quest 12? Kingdom Hearts 4? Nothing on the horizon. Second, they probably got access to PSSR before anyone else did outside of Sony 1st party and 2nd party.
The combination of these factors is why they're able to really be more aggressive with the PS5 Pro than others. Similar with Hogwarts Legacy and WB, probably one of the first studios Sony went to.
Game Science wasn't even able to implement an LFC 40 fps mode on PS5 yet.
Almost all of the Sony studios games are getting PS5 Pro enhancements, but who is missing from at least day 1. Helldivers 2, Returnal, not even a confirmation for Astro Bot. Smaller teams. Bluepoint is doing Demon's Souls, but again it's a light touch not a heavy one.
CDPR is a major candidate to do a PS5 Pro enhanced Cyberpunk, but it's a massive game to update and they're very busy with The Witcher and Witcher 4, so who knows if we'll see anything or how heavy the update will be.
One thing we might see is developers getting used to using PSSR and then going back to implement it on older games when they have time, but this idea that it's like flipping a switch is just massively ignorant.