DISCUSSIONS on “Rules for online games in HoMM3 and formulas for calculating player rating.”

20+ any 2nd-level archers and 20+ any 3rd-level units already constitute a blockade; I'm generally fine with such a defense.

This isn't a blockade; it's an expansion (s).
No, seriously, very often a secondary hero guards 60-70 War Lizards. And they can be defeated. So, should we consider a smaller number of them, twice as few, to be a blockade? Then you won't even start playing on Jebus; there are blockades on the roads there.