Secondary skills in Heroes 3.

I disagree with that... I've encountered various warriors... With a well-thought-out strategy, it's not particularly difficult to deal with them...

And I often see that with proper development, a Warrior can easily defeat a Mage. It's true, it wasn't a Barbarian, but a Knight, but that's just luck.
The enemy Mage had a high Intelligence stat and over 200 mana, while the Warrior only needed Expert Speed. The thing is, the troops of your favorite faction are certainly not weak, but they can't even compete with humans in melee combat.
Goblins in the final battle are practically useless, Golems and Gargoyles are only good for protecting your Mages, and Djinns are also not the best offensive force... In melee combat, you can only rely on Nagas and Titans, but that's not enough!

But with humans, every soldier is an excellent fighter. Starting from level 1 and ending with level 7, the Archangel, the strongest creature of all castles. Speed and an army of humans quickly advance, cutting down mages who are not used to brute force. :)

So you're wrong, you're wrong.
It's better to be a good warrior than an average mage.