Good or no good?

[Viviza]

puts more strain on healers

Having a shallow pool of HP puts more strain on healers, not less.

A tank with low health has to be keep topped off to prevent them from being burst down. It lessens the window that adlo, regen, and fairy heals can keep the tank vertical while the healer does other things. It makes using cleric stance and casting DPS spells dangerous, and instead forces the healer to nanny the tank's health bar.

There's a balance to be had where a tank equips enough strength to increase their damage, without risking random deaths and while allowing healers to chip in their own share of damage. That balance is more than tankbuster+1 HP.