I also to have to wonder about the cost difference in dollars of specialized camouflage vs all terrain. Saving (what I would I guess is) at most a few dollars per uniform in production is hardly justified when the trade-off is a risk to human life.
It really doesn't make a material difference to your point, but just to note that it isn't just a few dollars per uniform. A soldier's webbing, bergen and day sacks (all their battle load carrying equipment) is highly personalised, takes a lot of time to break-in, and takes up a lot of space. Maintaining three or four sets of that in different patterns for different environments would be a huge hassle.
A single pattern effective almost everywhere makes more sense than in just simple money.
A pretty normal year for a regular, non special-forces, soldier could be an exercise in the bush in Kenya, in the artic circle in Norway, in the jungle in Belize, in European temperate mountains, in the desert in Oman...