DPS/HPS/TPS Meter

[Tonjiar]

I understand having a DPS meter but what is the point of a HPS or even a TPS?

HPS
Knowing your total Healing output with overhealing
Knowing your actual healing done without overhealing
The percent of healing done versus your other healing partner in one of the 8-man raids.

TPS
Can put numbers to the test to find the best threat output either on a dummy or in a live encounter.
As a tank in other games, if the threat levels were shown in a number format, I would break down the rotation to get the most out of my class. After al,l the more threat I could do then more damage my dpsers could do without using any threat reducing mechanics.