While I am not quite sure that we can have as many MIC types as we want, I think we can. Additionally, the recruitment of units can rely on several more mechanics than a mere MIC, as we have a lot more options available to us due to being able to script recruitment conditions with event counters.

We could now for instance say that a unit is only available in Bartixia if you have created a Megaclasmai Factory, Plasma Reservoir and Duck Pond there, the Zork reform has happened, Atlantis is controlled by the evil Godzilla faction, and the happiness level of Uranus is at least Content. Good times.