I think the Devs explicitly stated that Armour would be a value that decreased incoming damage, rather than something selfhealing. The selfhealing will be reserved for stuff that gives Invulnerability Saves, like Refractor Fields, Iron Halos and Storm Shields.
Yea. And ridiculous names like ponyfan2000loveya4evaaaah. That kind of stuff can be labeled as heresy and sent to place even god emperor doesn't want to know about.
I was referring to having the Techmarine be able to fully restore a Space Marine's armour to 100% if they go with having damage thresholds.