I love new sentient equipment, but after getting living armour it loses appeal. Would it be possible for Sentient Armor to copy Living Armour upgrades?

I think it's pretty balanced in a way that it makes you a little more durable, but it uses will in exchange.
Also this makes hefty cost of diamonds not wasted after you make Bound Armor.

I believe Way mentioned on a dev commentary on youtube, or maybe on direwolf's series, that sentient armor applies enchantments from equipped armor in addition to its base protection level.

Yeah, Sentient Armour will not upgrade like Living Armour does, but it now does more fun stuff.