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Bog, I've been watching you for a while. I kept thinking, "never mind," but I'm going to say it now.
Before writing tactics or strategies against a human player, it makes sense to play against a human player yourself. And not someone at your level, but against other players, preferably stronger than you. Then there will be more benefit from it.
You write, "Who among reasonable people would get angry at your gnolls?"
Or, "Why did Korback give up?"
Wow, you're fast. Level 23-24. I've only had a hero reach level 24 a few times in all my games :D Is that what you call a "fast game"? )))
I agree, no one will get angry at the gnolls, no one will rush forward, and no one will immediately attack – that's a given, but in a battle against a human, it's quite possible to use gnolls to deal some damage, and then attack with the rest of your units (in the end, you can even teleport a stack).
Level 23-24 is just a conditional boundary for me; it's around these levels that all secondary skills will become expert.
Of course, in a fast game on small or medium-sized maps, the hero will usually not reach level 15. Often, they won't even reach level 10. On large and very large maps, level 20 will probably be reached only at the very end of the game. But if you play on a large or very large map, taking your time, developing, and gradually clearing the entire map, collecting and visiting everything there is, then you can easily reach levels 23-24, even 35-40 (but that's probably already "too much").
Korback is just an average hero; why not use him? First, he initially has the Pathfinding skill (not Logistics, of course), but it's useful on some maps. Second, his special ability is for snakes; I think it would be good to slightly increase the stats of the snakes, as it's a fairly useful unit in battle.
Yes, I'm busy with things this summer, but I'll definitely play against stronger players later.