That's a remarkably well written suggestion - I think that it alone will win the support of many of the forum users.
Although there's the first "no" reaction from me for seeing an overpowered, nearly unobtainable set of armor, the other points - such as vulnerability to magic damage do make up for it. It should also incorporate a number of different effects, too - to make a set of bedrock armor "not just armor". It could reduce knockback taken, have increased speed on iron blocks or water(electromagnetism?) or increase potion throwing range.
However, I do like an armor suited for specific task, and even more so I do like the usage in maps and Kit PVPs.
About piercing, now we have potionhead arrows, so there's little use of it IMO. Couple of Poison heads, Harming II heads and a Flame enchantment would make sure to hinder a bedrock warrior.
I say Yes. Although my "Yes" is weak, because on the other hand it will setback new players because it can be stronger armor without enchanting, it does have some way around that - and it is magic and teamwork.