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I don't see the point in increasing the number of skill levels and the number of abilities from 3 to 4 – in general, if we don't consider the deliberate lengthening of the game, I don't remember ever being able to fill all the free skill and ability slots (personally, I only did this in campaigns, and not even in all of them), and in multiplayer, even reaching level 25 is a rare occurrence.
Colleague, when you complete a single-player map or scenario at the Hero level, and even with neutral armies, you often finish the game at levels 35-39. I'm saying this based on my personal experience. In particular, our team is currently testing single-player maps: scenarios, campaigns (plan-150), and I can say that, for the most part, we finish the walkthrough from level 32, and sometimes even level 39.
It often happens that after level 32, there are no free slots, as they are all occupied by skills and abilities. And it becomes uninteresting to play – you level up, but you don't get a new skill.
Therefore, if an alternative progression option is offered with an increase in the number of free slots, for example, from 5 to 8, we will be happy to implement it.