So action is GFB. Bonus action is normal weapon attack. That was what I was try to say.
I figured, just spelling it out...not because it's helpful, but because I'm pedantic that way sometimes. *shrug*
But the main point is - yes, plate+shield+Heavy Armor mastery is probably the toughest melee tank going (except possibly Bear Totem Barb).
But going any other option (great weapon, crossbow expert, dual wielding) sacrifices AC (and possibly that 3 DR from armor mastery) for extra damage (and usually better Dex saves - Armor Mastery and plate does no good vs a fireball).
Shield Master does help close the gap though - but that's another feat on top of Heavy Armor Master, so you have to consider what the other builds can use that feat for as well - the great weapon and crossbow expert can use to either increase their damage (sharpshooter for crossbow expert) or their durability (both heavy armor master and great weapon master for the great weapon guy).
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