"Dead Man’s Plate remains too strong and is crowding out other choices"
No, it is not too strong. This is not the reason why people are not buying other armor items.
It is because you made every armor item so bad, that it is hard to choose something different from dead's man plate.
Thornmail is a noob trap, Frozen Heart is a niche item, Randuins passive is also niche, Sunfire is just...Worse than dead's man plate( buff it instead of nerfing even more DMP). And I can't remember any armor items except
that's well....has a very specific use and
which is a AP mage item.
We either need more armor item options, or you will nerf all of them to the point that we will have no reason to even buy them
He recommends triple armor and your first thought is Malphite?
Ok.
It's pretty much a better frozen heart now, save for a bit less armor.
,
, and
have
listed as recommended items for them, but in reality, SFC is a horrible item for them if they are going support (Tahm sometimes go top, where SFC is a viable item for him)
I get all the time. Especially when other team has two champs building crits.
and 
, because reasons.
Yo.