I found the justification very amusing: because dragons were a too powerful creature, they decided to remove them from the regular units and make them bosses. Yes, that will improve the balance much better :rolleyes:. Although dragons as level 7 units were quite balanced. It doesn't even need to be said that having bosses in the army (as stated, they can still be recruited) will create a monstrous imbalance.

I didn't understand the idea with spell-abilities. How does that work? Then there won't be enough experience points for all the spells! However, it's hard to understand in words – you need to see it.

As for what they did, it seems normal, and now it's clear why they removed bone dragons. They weren't balanced in terms of realism. A dragon should be stronger than other level 7 units. So, bosses will now be dragons, and I like that idea because dragons will now have their actual size. And I also liked that they can be added to the army, but I would like it if, when you have a dragon in your army, the battle map would simply zoom out (i.e., the dragon would be somewhere on the side, in the back, and your other units would be arranged either in front or in the center, or somehow else).
And I understand, so there won't be a magic guild now. A warrior hero learns abilities, and for a mage, instead of abilities, there will be spells.
I liked how they explained reputation – life, death, or neutral. Now, it seems that the hero's skill tree (class) will depend on their reputation.
And I didn't like that the fourth race won't be announced; perhaps the developers want to add to the already known races.
I think it's objective that they reduced the power of direct magic. Otherwise, it would be like in Heroes 4 with the Order, Death, Nature, and Chaos factions, where, after upgrading magic, the soldiers become useful only for covering the hero-mage, and in these factions, the warrior hero is much weaker than the mage, and the same was true for Life; the mage hero was more useful than the warrior.