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Don't forget that, besides blinding, humans also have time stop and stone skin. In one turn, you can weaken up to 3 units (panthers, harpies, and centaurs). And only an orc mage can remove spells (and only once per game, with purification).
Unfortunately, centaurs and archers won't carry you through the entire game.
The main damage dealers are still mass killers – panthers and cyclops. Centaurs, harpies, and archers are support units.
What's great about the orc mage is his magic. They are truly powerful. People often underestimate them and attack other units instead.
I usually take 2 groups of mages, increase them with the blessing of the earth, then multiply one group with reinforcement 2, and with fury 4 (without a response) – few people like that))))
Added 7 minutes later
Or maybe we won't argue, and you'll be able to defeat a light human mage with an orc mage in a fair duel.
That would be a truly heroic feat worthy of respect!