If that makes it easier, I'll explain it differently, in a completely different way. 1) The most important aspect of the 2-2-4 build is the pursuit of the 3rd-level perk (it should be noticeably stronger than the previous ones). 2) But even with that, you can develop mixed builds for different situations. I answered the questions from the last paragraph of your message (specifically regarding hero-engineers and others – read carefully!).

Added 9 minutes later

When I start implementing the planned features on the map, I will actively play on it, and many things may change accordingly (where I was wrong), but the focus will always be on Multiplayer – I won't be playing and testing against the computer.

In the end, for example, the WGE duels turned out the way I originally suggested, even though it was initially rejected. The speeds ultimately remained at the level I proposed (a slight reduction and leaving the flying units untouched), instead of the level that was intended. Oh well. And the systems are different because I'm comparing them to the original, while you're comparing them to your mod. And that's already incorrect.