One thing I really like about Game Pass is that it lets me try out games that I've been wanting to play but never got around to buying. Games like Ace Combat, Bloodstained, Jump Force, etc.
Also, it lets me try out games I never would have bought otherwise. Something like Minecraft Dungeons, for example.
Game Pass is kind of like my own digital Blockbuster rental service........haha.
Can you imagine how handy and valuable this will be when you pick up the Series X and everything is so expensive at the start of a new gen? Even if you didn't buy a single extra game for the Series X, if you had Game Pass, you'd have access to literally hundreds of games to play! Sure, most of that will be games from prior gens, but you'd also have guaranteed access to any new 1st party titles released at Series X launch, like Halo Infinite.