Reasoning for removal of TP, but not MP?

[Millybonk]

TP was useless, I do not understand why anyone would remove MP. If you remove MP it wouldn't even make sense.

Don't just say something without providing evidence of some sort.

TP got removed, which results in any TP class being able to spam their AoE spells all the time, which wasn't possible before.
Using that as a base it makes no sense why any AoE spell on a MP class still cost resources, right?

If the scope was to enable AoE spamming you would grant it both groups, TP and MP classes, and not just TP classes.