Speed factor.

I read the comments and thought: what did I miss? I reread my post - and indeed, I forgot to clarify: everything I said applies to playing on large maps (I'm tired of repeating that I only play on them :)). In online games on medium-sized maps, and in general during the final battle in the middle of the 2nd week, everything is naturally different: there are not yet many high-level units among most players, and if there are, they "don't make a difference". But when dozens and hundreds of high-level creatures enter the battle, then a completely different "situation" arises.

I can't resist: To understand how weak these factions are, you need to play offline. Seriously: how many times have I played with large armies, and I don't consider Swamp and Stronghold as serious rivals. For me, they are more like cannon fodder, allowing my main hero to level up nicely. Almost always, such battles end very quickly and without losses.