"HW rulez" mod (add-on) for HoMM3.

Yes, it's been confirmed. Although it's not mentioned in the rules anywhere, rumors are circulating.

I won't forget how Guingmgs attacked the Pegasus stall for "garbage" with some weak units in Inferno on map 111, captured it, and then used the 35 demons he gained to take a mini-utopia.

It's one thing to break through a weak defense for a small reward and then capture it in your own zone, and another thing to roam around the map, defending weak units, so you can capture them at home for an unknown reward... The isolated cases you described are isolated for a reason... Do you want me to remind you how many times restarts happened because of these weak units? It happens in about half of the games...