In 5E, in actual play, have you used any of these at all during the time that they have been published options? I will be posting several polls separately to get a feel for what people are actually doing.
Moderately Armored serves my warlock surprisingly well. Between the shield and half plate, it's worth five points of AC. (Or, depending on how you measure, four points of AC and two points of Constitution.)
I've seen the armor ones taken occasionally & dr3(?)/- or whatever it is that heavy armor master gives isn;t bad for some builds. The others are trasj\h
The Armor feats are okay-ish. I love MA on a swashbuckler, with their taunt feature they play like a MMO tank. If your stats are already maxed out, you could take light armors for your casters or heavy armor for valor bard and such.
Dungeon Delver is a must have everytime I played a classic Thief in various dungeon-focused adventure.