Physick is too weak for lvl 60 casters?

[Aegrus]

First, 10% of a dps classes hp is about 1-1.2k hp atm. 10% of a tanks hp is almost 50-100% more. 2k is a wildly absurd number for a dps to be able to spam. For perspective, clemency, the aforementioned paladin specific heal, heals for 4.5k hp in full str gear, and about 3.3khp in vit gear and costs about 2.5kish mp. Cure, if it healed like you requested, would do half that heal, and cost 500ish mp. See a problem there?

Even a 1k heal, means that casters are preferred just to heal themselves through mechanics they weren't designed to live through without a healer being present. Again, this is just an attempt to explain the design choice, as it would allow for players to cut out a healer slot for another dps, bypass certain heal checks by stacking the same classes, and overall do fights in an unintended manor. While I have no personal problem with unorthodox strategies, the developers rather not trivialize an encounter in a way that eschews class balance and cheapens relevant content.

If they intended for casters to offheal occasionally, they would design a skill similar to paladins, which now fills that roll in a pinch healing situation. They would also balance fights around that being a possibility, and further requiring certain classes, which they tend to avoid. Oh, and it'll further confuse DPS classes, trust me, don't even hint that dps should be trying to heal in a fight, most have a hard enough time doing just the damage part.

While the intent the op, and assuming you as well, is well intentioned, I believe it is also shortsighted and doesn't consider the greater implications.