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I agree that 3 is too much, but 0 is not enough.
I used to believe that restarting at will shouldn't be allowed at all, but Heroes has changed my mind. Twice in a row, I lost hopeless games that I heroically played, and as a result, neither I nor my opponent enjoyed it because the game was not competitive; there were simply no chances from the beginning. The opponent just had to avoid making mistakes, and they would easily defeat me without any options for me to fight back.
As an idea, 1 restart within three days could be a good solution to eliminate completely unplayable scenarios with unexpected blocks everywhere or almost everywhere.
For me, the real problem seems to be that a completely unplayable situation can occur, with blocks on all roads, for example, which you check on 112/113, and everywhere you have to go around and lose tempo.
And the waiting for a good match is a problem created by the players themselves (and now by me as well, since restarts "at will" are allowed, and the opponent will also use them).
Well, it needs to be tested in some tournament to gather statistics