Quote Originally Posted by Thrice Dead Cat View Post
Actually, if he's been keeping pace, as he levels and the challenges increase, he should remain at that pace. Unless the campaign has a large focus on endurance, he should still remain at roughly his current strength with both multitasking on being a wizard and aiding his comrades post combat. The action economy will prevent most MTs from dropping their slightly larger pool of spells in the same amount of time as a straight wizard or cleric.
True, but we're not comparing MT with straight Wizard or Cleric. We're comparing it with Wizard/Cleric.

MT is more powerful than Wizard/Cleric because it gets access to higher-level spells. It's not at the same rate as the pure, extremely potentially powerful Wizard or Cleric classes get it, but it's at a good rate.