That's not brought up to par, that makes it stronger in comparison being free. TBN does a huge no damage barrier, and having a heal on top would make it insane.
TBN being free comparisons, no drawbacks
Holy Sheltron/Intervention as I said isn't a whole free choice, it's restricted used. Reqs Holy is extremely restricted, Paladin don't get free choices when to use their healing, Clemency exist, but you would only kill the jobs DPS.
HoC only compares on TBN if it's below 50% HP kicks in, otherwise it's a short damage mitigation, Healers have O-GCDs needing use that do the job better.
BW is the focus problem, can pop anywhere anytime, gains in all cases.
TBN being free, plus no drawbacks, and 25% max HP barrier is very huge with more gear support. Oblation buff too? Bruh, you'll have to be crazy lucky to obtain these level of adjustments, we don't need tanks being more invincible. Instant 25% max HP barrier is incredibly strong, and it carried a lot in Eden Savage raids. I agree TBN drawbacks need to be removed, I got no problem with that, but it's over stretching the bar asking for more. We absolutely do not need another HW tank meta.