A hero on the battlefield is a double-edged sword. Personally, I was looking forward to this new feature, but then I was disappointed. He has no place on the battlefield – let him stay on his horse. A hero on the battlefield is either a punching bag or a monster. And there are no alternative development paths for the hero.
And a hero on a horse is just a spectator, who is somehow not involved. He just casts a spell and immediately hides.
There is development. With the hero participating in the battle, the gameplay becomes more interesting in terms of tactics.