Firstly, this is a universal tactic for all random map templates (and for easy ones, like Ring, and for complex ones, like Meeting of Mazgob - standard Sodov templates).

And also for standard 8MM6, 6LM10, 8XM12, etc.

As for fixed maps, this tactic is the ONLY one that works there.

But here you are wrong. A fixed map is a fixed map; it will be as you design it. Let's take one of the most classic Heroes maps - Dragon Pass (it was in the first games and is still in the fifth, almost unchanged). This tactic clearly won't work there. After all, nothing prevents you from using such a map in a tournament. For example, in the tournament of our SoY portal, there were maps where neglecting the castle's economy was definitely detrimental, and AlexR knows this firsthand. To deny games on such maps means to deny a part of Heroes itself.