Not to mention being completely at the mercy of forced updates which can ruin your favorite game at any moment. People bitch about having to install from disks and patch manually, but I value that freedom and control.
For example, for me, Company of Heroes peaked at 1.71. This is fine because I simply install it from disk, apply the two patches required to get it to 1.71, and play the game exactly how I like it forever. I wish I could do the same thing with some modern games, which have been ruined by developers who don't know when to stop tinkering with their work.
Only GOG seems to be allowing for the old way of installation for new triple-A releases. I'll never be forced to install any particular version of The Witcher 3 or Cyberpunk 2077 because I have the offline installers and all the incremental patches saved.
Especially since they have no interest in selling locked hardware. You can still buy Rag Doll Kung Fu, a game that's been on Steam longer than some Steam users have been alive.