6 months ago - Secret Master - Direct link
To add to what others are saying, I can have 15 MIC on infantry kits as Germany, and I still keep them on the starting infantry kit and don't bother researching the better ones simply because I want to keep that production efficiency going.

Keep in mind a few things about infantry kit production:

1) Swapping to a new type of kit kills production efficiency.
2) Higher tiers of kits cost more to build.
3) They use more steel.
4) Germany has a ton of occupations to manage. You probably need kits for those, but the type of kit used by garrisons is irrelevant. The worst infantry kit is fine for shooting partisans in France and Yugoslavia.