said by battleop:
That can be done but equipment, towers, and engineers are not cheap.
Most of the engineering is about picking locations, prepare mounting arrangements and getting uplink/power on-site. You have none of those problems with embedded pico-cells in subscriber CPEs since the wired subscriber provides all of the above for free... doesn't matter if individual pico-cell placement is sub-optimal if you have many times more cells than you need to handle demand. Worst case, you turn off some cells where there is excessive overlap.