I disagree with regard to Minecraft (only game I played in that list). I bought the game while it was in alpha and even then the single player experience was outstanding and sucked me in. I still have vivid memories from 15+ years ago. The balance of creativity and survival (and friggen creepers) was perfect.
I dont think I am alone in saying this. IIRC the game was making millions while still in alpha.
Yeah, I think Minecraft definitely still would have been a hit without any modding. Though it might not have become the absolute juggernaut that it is now without it -- it's hard to say for sure.