Dreamcast because you could just burn a game to CD and run it on an unmodded console.

Original Xbox because you could slap on a no solder mod chip and boot from the hard drive. Suddenly you could switch up the loader, run modded games, run emulators… Truly ground breaking for the console scene.

Or SNES if you’re the kind of weirdo who buys a console because they like games.

Dreamcast because you could just burn a game to CD and run it on an unmodded console

My friend spent summers in Greece with his family. He said there was a shop there where you would give them like a dollars and you would take the game home, burn it, and bring it back. Of course this is what doomed the Dreamcast. Noone wants to make a game for a system where you can just a disc into a consumer burner and copy.