Regarding the human factor: probably in every game there are mistakes we make, both with neutrals and with enemies, related to battles, capturing buildings, and so on. Let's be humane and play on autosaves — it's frustrating when you mess up simply due to a mistake, so let's always allow that:)
I'll put it this way: being able to maintain focus and avoid mistakes and violations is one of the qualities of a player's skill. I personally strive to at least learn to play Heroes well — I'm not talking about master classes — I hold myself to standards, and of course my opponents too. And to improve your skill, you need not only to watch saves and analyze games, or just play a lot, but also to have discipline, learn to change strategies on the fly, and be psychologically resilient to "stressful" situations in the game. Don't get upset when mistakes happen, but immediately look for counterplay opportunities! And lastly, NEVER give up! During the game, you must not know how to lose! But you must be able to accept defeat after the final whistle! All these qualities together yield the result. Sometimes it's a simple game, but the emotional tension is high, the spirit of competition is stretched to the limit — whoever flinches will lose. In conclusion, let me present a scenario: it's the 9th match, the score is tied, and in the last minute one of the teams commits a violation of the numerical limit (killing a scout hero), or the goalkeeper accidentally throws the puck over the board when he meant to bounce it off the boards from the zone (misclick), which the opponent capitalizes on. That hardly seems like a fair way for the winner to have won:)