How to effectively use quick battles (autobattles)?

Actually, that's not true. It doesn't depend on which map you're playing; it can happen anywhere. Or it might not happen at all. It's just luck, good or bad.
And I'll repeat, with the HD+ mod, 99.9% of these cases are resolved.

That's understandable, but someone mentioned "artificial" difficulty, so I gave examples of custom maps where you can get almost any artifact or troops, and other situations can arise on the map. The point was that on standard maps, when you attack with small forces, mana and spells are limited, so the battles will be simpler, making quick battles more reasonable. Not to mention the No Death mod.