I asked you first!!
My reasons for blousing pants in garrison are simple - and I'm not a blind obedience sort or "uniformity at the expense of common sense" kind of person - and that reason is that dress and deportment while you are in garrison is important. A bunch of troops trotting - marching- around with pants unbloused looks like crap. Some may tuck their sand traps in, some may not. Its, IMO, unprofessional looking and touches on the slovenly.
While you are in the field on a tac ex is entirely another matter. Ventilation and circulation is important. If we had allowed troops to unblouse in the field in the 70's and 80s maybe I wouldn't have the unsightliest set of varicose veins on earth.
If we are deployed in civvyland on an op or exercise....that depends on the Chain of Command. A tinge of common sense must be used.
A few years ago some of the senior leadership didn't like the pictures coming out of the sandbox, troops in FOBs or on patrol with unbloused pants and sleeves rolled half way up.....the rocket went out to put a stop to it.