In turn-based strategy games, this was practically not used. And here, it is introduced directly in two games. I'm not saying it's bad, but it does raise certain thoughts. In AoW, for example, it increased the value of expendable units, specifically for flanking attacks. There is also a leader class that actively uses this mechanic (the rogue, some of whose units deal particularly painful attacks from the rear). I will be happy if this also diversifies the battles in Heroes!