Reasoning for removal of TP, but not MP?

[Millybonk]

Most of the caster classes already could spam AoE abilities just fine. Spamming of AoE abilities is not the issue.
It is mainly healing that is limited by MP. For anything else running out of MP/TP is/was almost never an issue.

Do you actually believe that?

A test for you then:
- You as healer, a tank and 2 other TP classes at a level, when you as healer have access to a spammable AoE spell, e.g. lvl 45 as WHM to get Holy
- Tell the tank to go at an aggressive pace, but slow enough for you to have plenty of time to dps
- Cast your healer AoE-spam ability as much as possible in an attempt to keep up with the now permanent AoE-spamming of TP classes without letting anyone die
- Come back to me how long you were able to keep the AoE spamming up without neglecting healing due to AoE abilities for MP classes still costing resources