Пандора
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So, in general, only one mage has to carry the burden for the "HAVEN" Castle... who can only do something on their own starting from level 4 of Haven magic... if they don't have that level, they have to rely only on the units nearby. (He's terrible until he levels up to the fifth level of Haven magic).
That's an exaggeration. In my opinion, you're wrong. Firstly, don't forget about the units (we're discussing the castle as a whole). Secondly, saying that "the mage has to carry the burden for everyone" can be said about any castle's mage. He's a hero, and it's his responsibility.