To clarify I think you mean roguelikes have maps where the character is the size of a pixel of map information - so you can't stand in a position that only part

To clarify I think you mean roguelikes have maps where the character is the size of a pixel of map information - so you can't stand in a position that only partially overlaps with the position you previously stood in... all game forever (probably?) will have coordinates the big difference is how substantial that coordinate system is compared to the size of the player... having pixel sized players makes a lot of stuff really easy like detecting drowning by seeing if the pixel you're in is flooded - but it's really unimportant on a gameplay level... it just simplifies the tech needed to build out the engine.