It's always been this way. Nothing new. I was an infantryman for 8 years in the 1990s. I never (or I should say- rarely) had the best equipment the Army could supply. The Rangers had these ceramic inserts for their vests, we simply had vests. It takes a while for equipment to be issued to all members of the military. It's just the way it is. By the time all the troops get the latest high speed equipment, the SpecOps guys, Rangers, Infantry units (in that order probably) will be moving on to better things and equipment and the lower echelon people will still be using the older stuff.
We will always be in a situation where we can say "Why aren't all the troops equipped with the latest gadgets?" Always.