@ DefiantMars - support most of the points, except 2: The hybrids only getting 3 unique units isn't bad, core affinities only get 4. It's not that big a difference. And I like that Chosung is spies, but different. Saying it steps on the ARC is like saying that NSA's stronger cities steps on Brasilia's war score, since their both tied to military systems. If it's a core mechanic, there should be room for more than one sponsor in it.
Hybrids will also get at least the first unique unit for each of their partial affinities, and the ability to get off-affinity upgrades for them (which we haven't really had a use for before)
The same is true for the affinity perks. Hybrids will get their hybrid perks as well as perks from both their partial affinities.
Between these two forms of crossover, it actually does seem to me like the hybrids will be a proper "blend of both" rather than a unique new affinity.