Why do they try to make tanking harder?

[Lafiele]

When I go as a healer on low level dungeons I use to be cleric stance 90% of the time. There is just nothing more to do, and we don't make it to make you r job harder, is just to make things faster and to do...something. Of course, I heal my tanks before they die, but I don't fear to have them go under 40% of his HP. Some healers just stand there...healing, and have tanks at max HP all the time. I don't think that's good, but I undertand that some tanks feel unconfortable being on low HP.

As a healer myself I always put keep tanking alive first and dpsing myself 2nd.