Mobile phones and computers today have a pretty high IC count.

I mean, an arcade board is pretty big, but the parts density is also pretty low.

You might be surprised. Modern electronics are highly integrated; a modern smartphone is probably no more than a few dozen ICs. Vintage arcade hardware tended to rely heavily on discrete logic; even a simpler game like Asteroids had somewhere around a hundred ICs on its main board.

I'm no stranger to 74xx. ;)

iPhone X has 72 integrated circuits on the main board, and quite a few more on other assemblies.

I agree that Asteroids has approximately 100. We're really not too far apart in device count.

Then when you look at, say, pin count, there's no contest at all.