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Yes, when breaking through defenses. It's not good in the final stages, where each stack should be fully functional. If even in the final stages, early on, there's no way to hire these fully functional stacks, the enemy can just as easily separate a couple of Druids or someone else and quickly eliminate that couple of Knights.
Added 8 minutes later
I would also like to draw attention to two heroes who are mentioned the least - these are Myv and Rutger. Compared to Grok, he will be a little worse in terms of skills, but you can get the missing logistics skills early on, which will be useful, and that's a fact. Take the native lands and find boots, and you already have peasants with a speed of 7-8, who can practically reach the enemy, and the Knights run freely across the field with Griffons and Angels. Add "Path of War" to this, and you will be running around the map, covering huge distances, especially when there are many mobs around... Myv is also a very useful hero. At first glance, no, the skill is alarming, there's not much magic... I think this is the only Knight hero for whom both Light and Dark are a plus. When using Haste and Prayer, the initiative of Griffons and Paladins is about 30. Add Slow, and it will be something like an Agrael, but from human forces, very powerful. I'm saying that it's worth taking into account and appreciating such a parameter as speed, in which Axel, Dugal, Laslo, Ellaina, and others usually lag behind.