Aye. And there are things the player can do that lets them take 2 attacks for one action, but you get a normal Multiple-Attack-Penalty progression between each attack, and there are things that let them take 2 attacks for 2 actions -- as would be normal -- but which do not progress the MAP until after the second attack is done. And there are a lot of each. Or rather, there's functionally 1 of each, but it's often named different things for different classes.

The single-action variety can be seen, in-world, as being very fast, taking multiple individual attacks in very quick succession, like with Flurry of Blows. The two-action variety can be seen as hitting someone with two different weapons at the same time, as with Double Slice.

It does bother me that both let/make you pool your damage for dealing with resistances/weaknesses. Given the choice, I'd probably have the two-action varieties pool damage, and the single-action ones count as multiple instances. But nobody asked me.