Probably some other stuff I forgot, but Valve didn't take your physical media away, which they can't because almost all games on Steam are from different developers and publishers who decide on their own if they want to print physical. And they still do and can. Sony's decisions is forced on everyone, so there is no alternative. Not to mention it kills the official retailers and secondhand market that made games vastly more affordable compared if you had to buy it from PSN directly. And again the games on Steam are unbelievably cheap, physical media or not while the prices at Sony are just going up.