IIRC, OneWeb's initial plan was to use phased arrays as well, but it proved too expensive and they switched to mechanically steered antennas (at least for first gen).
Phased array is definitely the way to go if you can get cost down. No moving parts means fewer hardware/mechanical failures and less noise
Phased array is definitely the way to go if you can get cost down. No moving parts means fewer hardware/mechanical failures and less noise