samadura
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This is all nonsense — one hero. In the first week, I usually treat all purchased heroes as main ones — one breaks through here, a second there, and a third might even grab a chest off to the side, and it's all with a single army — no need to split anything. And all of this can be pulled off in one day. With your tactic, it would take three days. Of course, more real time is spent per turn, but the game moves more dynamically. After all, we're playing Heroes, not just sitting down for a quick half-hour run. And movements should be planned during the opponent's turn.
This is a very good tactic — a tactic of its time, so to speak. For instance, I play as Tower; on 1-2-1 I buy 5 Nagas, and why would I add them to the Cap army? Why use a sledgehammer for a nut — Caps clear from the left, Nagas from the right. But if someone "fat" is standing somewhere guarding something tasty — immediately, like a chain, Nagas and Caps together. The army merges in an instant. And you say that an enemy hero will just suddenly pop out — he won't. Improve your scouting.
:D A unique strategy to clear with one hero in one direction. Perhaps it's better for Necromancer — because while you're leveling up the second hero's necromancy exp, the first one will raise an extra twenty skeletons, without which the final battle simply cannot be won. :D Not to mention those who have no necromancy at all. :D
:D How many skeletons will a Necromancer raise from the Dragon Utopia? :D Loss? What loss? Sleight of hand and no cheating.
And on topic. :D Level up scouting, literacy, and wisdom — so enemies don't pop out of the dark (since the army is split — 8 main heroes :D), and to spot a level 6 external dwelling immediately — otherwise you'll be wandering all around the mountains to get to it. And a literate and wise man, well, or woman — will bring a town portal in time, so you can return home immediately from the end of the treasury. :)