Diamond is two CMs, a DM and an AM. Standard 4-4-2 is LM, RM and usually two CMs (you could theoretically have a DM or whatever in there but we're splitting hairs). To show you the difference, if you look again at the Liverpool formation, you can't really say Allen and Henderson are wingers - they both play fairly centrally. In a diamond you're relying on your full backs for width, or a striker or your 10 drifting wide.

Also perhaps, but let's note that 4-3-3 and 3-5-2 doesn't require your central 3 to be as good as your central 2 in a 4-4-2, owing directly to the numbers game.

Also also, I SAID it helped your point you Borini xD It straight up called out Vidic on smurfing up which agrees with what you said