Military tech tends toward robust devices with specialized functionality, rather than trying to mash a whole bunch of different capabilities into a single device. The communicator thread already discussed how Trek communicators are absolutely not analogous to our civilian consumer-level smartphones.
Trek tech works just fine as an extrapolation of present-day military tech, which is nothing like the flashy and gimmicky consumer gadgetry that we are accustomed to in civilian life. Never the twain shall meet.
Kor