...Plus three varieties of dragons, two of phoenixes, Great Eagles, Phoenix Guard and Swordmasters who are definitely more fantasy than any bear cav (they deflect arrows with their greatswords ffs). No, I really don't think Kislev is more magic than elves because they have lots of bears and 3 units on ice sleds. Pretty much the only less fantasy factions are Bretonnia and the Empire- and for the Brets you have to ignore their totally ridiculous background lore and not count superhuman knights as fantasy otherwise it's just the Empire. Well, according to what we know of the roster at least, we still don't have the full list on that which grows increasingly annoying.
And Third Age is 1) a mod, so has a niche appeal to begin with, and 2) set in a far lower fantasy setting than Warhammer, Beginning of the End Times is a more apt comparison and that crams as much usual Warhammer sillyness as it can get away with using their ressources. The design priorities for both universes are nowhere near the same, it's like saying 2001 looks more grounded than Star Wars, well duh, because Star Wars doesn't give any fucks about realism. Warhammer is a balls-out ridiculous setting and is better off being balls-out ridiculous to a certain degree, historical TWs are there for authenticity. Again, I do think they went a bit far with Kislev compared to my idea of the faction, but compared to the setting as a whole? Dang, the Doomwheel alone is far more stupid than all of Kislev's fantasy units put together.