Aren't the various Namco Museum compilations (with a few specific exceptions) based on the arcade version? Or do you mean you've never seen a physical arcade cabinet?

I once saw one at a skating rink... at least, it had Dig Dug art decals, but the game was actually Galaga. Fine by me, I loves me some Galaga.

Recently, I've also been getting into Tower of Druaga... lord help me.