There is no fundamental physical reason that a phased array antenna for the V-Band (wavelengths of 4 to 7 mm) cannot be fitted into a 14" laptop package or 10" tablet. They are in the final phases of FCC approval for such a constellation of 7500 sats, in addition to the already approved ~4400 Ka/Ku bands constellation.

There might be technical showstoppers today related to transmitter power and battery, beamforming effectiveness and indoor performance of a mobile device, signal processing difficulties etc., ergo "long term productization".