Gladiator

The comparison wasn't with ordinary heroes, but specifically with companion heroes, considering the ban on Dragon and Gelu. In my opinion, enchanters and snipers are very weak (their stacks are practically one-shot), and even bears with anti-magic under Kilgor will give more advantage than additional archers, for which you also have to pay a considerable amount.

For the Arena, there is no difference between a companion hero and a regular hero. What matters is how much imbalance their presence creates. When leveling up a hero to level 20, attack/defense specialists turn into a huge advantage, and their appearance significantly increases the chances in the arena.
This surprised me:

And Kilgor and the dragon specialist might have to be excluded.

So, the discussion is about companion heroes (their imbalance/usefulness), and no one even thinks about the real imbalance. This shows a complete misunderstanding of what is happening. I'm sorry, but that's how it is.