[ggm]

I thought even the current GEO orbit antenna were phased array. If not, there might also be the point that the aerodynamics for a phased array shell may be less expensive on fuel burden (less air resistance, less turbulence) and lighter, so cheaper overall. (at a refit cost)

[tyingq]

The Connexion antenna was all phased array with no tilt/yaw, but it was huge. The ones on aircraft now do track the satellite, tilt, etc.

[dreamcompiler]

Most of the ones I've seen still have moving parts. They're clever mechanisms and are not as deep as a swinging dish, but they're still motorized.