Vovin's post at the very beginning of the discussion.

Yeah, I found it. He's reasoning too subtly; the logic is understandable, but I wouldn't vouch for the claim that everyone would reason the same way in that situation. In other words, depending on the skill of both players and their opinion of each other's skill, all sorts of different game decisions can be made.

Regarding the purely negative value of the move, since everything has long been taken:

Even if not everything has been taken, the move doesn't stop being highly negative. Going into the opponent's territory is done either to kill him or to mess with him. Running around in a corner on rough terrain doesn't achieve either, but instead either gives the opponent time to consolidate (if the army is divided or elsewhere), or gives him the opportunity to catch your main hero in that corner. Plus, in 90+% of cases, there's nothing valuable there (for that stage of the game) even if not everything has been taken yet.

Hiding in corners with control can be done if the opponent hasn't already explored that corner. And cleaning up the opponent's corners only makes sense if there are no more free corners left. Here, there were at least half the map of resource nodes unexplored, and that's where he should have run to gather resources if that was his goal, and not to a corner that is at least revealed, and at most, looted, and with a high probability, a dead end.

So, there are two positive moves here: either go clean up the other resource nodes, or jump to the opponent and start taking castles, hit-and-run, try to catch a weak hero or a fast-moving unit, in general, interfere with his life/look for control, and turn the game into a running endgame, where you can exploit the speed advantage to find some opportunities. Everything else is negative to some extent.

For a player with such statistics as Britva, these are quite obvious considerations. Neither he nor his advocates have offered anything else. Essentially, the defense's argument boils down to "what if there's something there?". This argument might work for a beginner, but it doesn't suit Britva. Considering such accompanying factors as the break, the open editor (according to Navukh), similar precedents in the past, psychological mistakes during the defense, and the negative overall image and reputation, leads to a logical conclusion.