Clarifying Hybrid Warfare

The most expensive upgrade (Faster Infantry) is regarded as the most powerful upgrade.
Ironically, the most expensive strategy is the least used and probably considered as the weakest.

A Noob ask questions:
1. What the bleep is hybrid Warfare? What are its strengths and weaknesses.
2. Which country/map/scenario/blah would access the best use of this.
3. If we take the nerfs of its bombers, stealth (or upgrade sub/heli), would this be the most versatile strategy? (with 9 atk/7 def)

I really dont know what im talking about. Peace.

Cheaper inf is the most expensive upgrade....
As for what hw is, for the 100th time there is a units page http://atwar-game.com/home/units.php
and how to use it: use your head