Traditionally Command & Conquer doesn't have a unit cap (other than C&C4 which we'll ignore because it's awful) so up until this last week I hadn't thought too seriously about a unit cap in Miranda.
I've been replaying Homeworld (Homeworld Remastered) this last week and one thing I had forgotten about that game is that it has hard unit caps. The unit caps are fairly generous, but nevertheless there are caps (only 6 destroyers! can you believe it?) The reason behind the cap I suspect, is because unlike C&C, units carry over from mission to mission and the designers didn't want to make it too easy for the player to steamroll the AI by simply capturing every ship put against her in the earlier missions.
Homeworld's unit cap is per category, so 6 destroyers, 100 fighters, 16 salvage corvettes, etc. They are reasonable limits, but an average player is going to have to work within these limits eventually.
At the moment Miranda doesn't have a unit cap (other than a limit of 16 construction buildings per category which is purely a UI limit) although I always figured I'd need to add an upper limit at some point. Reasons to add a unit cap include:
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