I remembered during the time I was shocked to hear that Magician based classes were limited.
The overwhelming wall called talent was like a different world.
One could assume that they are also doing the method to reduce consumption of Maryoku in long duration battles.
But because of the difference in the amount of Maryoku—I was conserving it like someone who was on tiptoes holding a candle for lighting: they could freely ignore like someone who just found a 100-yen discount at the supermarket earlier.
With this, I understand the reason why people that are judged as 『having no talent』 would not be able to overcome the magician rank of B-.