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I must disagree completely. If games lasted for 2 months, then there would be no point in limiting mages. Any warrior will deal so much damage that magic will no longer be a threat against mass haste. How many of you have ever played as a mage as the main hero, and how many times? It's clear that you haven't, or you haven't developed them well. Solmyr deals 200 damage – that's around 113. But on the second level, it will be close to 1000. Where will all your angels be then? I still sometimes choose a mage as the main hero. In the last game, for example, against a player on HotA (I didn't post the victory). And in the last game on Hive, I took Aislinn on balance against Vova. On day 127, I broke through with 19 groups of creatures (damage was 600), even though I wasted two days on the first hero due to not knowing the build order.
Now there is one hero who, if he appears in the tavern, is a 90% candidate to be recruited – Galtran. And it's very unpleasant when, for example, when playing castle-ramp, Gosha appears for the opponent. There's no hope for a quick rush, or in the long term. But now, if Solmyr, Aislinn, etc. appear in the tavern, then we also go for a rush and win the game 80% of the time. Are such victories needed? Personally, I don't think so.
On any maps where it is possible to quickly gather free troops, mages have no place as starting heroes. Limit the same cons-hives, and mages will automatically return to the game. The weakness of the Tower lies in the specifics of the castle, and not at all in Solmyr. Old Man once wrote that a fighter for the Tower is much better.