To add to Exnomad's comments, axial flow compressors are more troublesome to control than their centrifugal cousins. Axials require handling bleed valves and/or variable geometry (such as variable vanes or variable area nozzles) to keep them from stalling and surging during part throttle operations and rapid accels and decels. The weaving of all this into a successful control system using hydromechanical means is even today a time consuming black art requiring much testbed work.
Sir Frank cleverly sidestepped this potential minefield by utilising a centrifugal compressor requiring little airflow control.