But surly a more frequent reassessment of the situation would make the AI better?
Of course not. In our game situation within 15 minutes can not be changed so that it was necessary the intervention of AI. Even 30 is unlikely.
Example: An AI Platoon moves towards its ordered location and finds itself confronted by a Company sized force. Now is it not more realistic for the AI to reassess the situation and issue a stop order to its Platoon?
Why should it needs the AI?
Or is it more realistic for the AI Platoon to carry on advancing against the odds towards the Company until the next 15 minute order cycle finally tells it to stop?
AI does not deal with this issues at the platoon level.
It does not work with the platoons/coys/units, but only with battle groups.
You probably mean under the AI something strange.
For AI something significant may change in the operational phase. In combat is extremely rare.