Healing is not so simple. Have you forgotten about Backfire and interrupts? Defile Flesh that cuts your healing down to 2/3? Even if we give those monks in GW1 100 armor they will still die.
In other words wammo, even if it ever worked in GW1, will not work in the long run. There are tons of ways to go past them, which the players will discover after a period of time. Shut down their attack. Shut down their healing. Then you have 8 useless wammos.