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I don't like having too many heroes either. But I liked the fourth game, where a hero could move around without an army (does Ilya Muromets really need a page?). And having many heroes running around is a tactic to keep things interesting; try to understand his point of view. He gathers resources and artifacts (although not immediately), probably following the principle of minimizing losses.
Added after 17 minutes
I have a question about leveling up a hero: each skill has almost 5 abilities, but there are only 3 slots. Do I need to choose, or can I add more abilities at a certain level?