If Sony didn't release games on PC they would be at a disadvantage in the digital locker age. in the digital locker age hardware will not matter you will just buy the software & play it wherever you like but it would be pointless for people to choose to by from Sony if their licence only worked for PS5.
This is where we are headed
www.neogaf.com
This is where we are headed
Next mind bending prediction: You will be able to play PS5 games on your PS4 , Xbox One , Xbox Scarlet , PC , Mac , Android phone & iPhone even if you don't own a PS5.

How big of a game changer would it be if Sony is using a large amount of ReRAM as the PS5 SSD?
Yep. I thought about it the second they announced SSDs. The problem would be: no PC support. The assets will be highly hardware specific, multiplatform games will not do it... That's a very good point. The PC and console versions of the game would have to operate differently. Perhaps this is...