Live synchronization of layout and schematic files is a feature you find in EAGLE, but in almost no other EDA program.
If you say KiCAD is not an professional EDA due to missing live synchronization, the same argument applies also to Altium, Cadence Allegro, and most other EDA systems which are considered as professional by most people.
Fine. KiCAD's manual tool still gives me more trouble than Altium ever has. How about the lack of a built in autorouter? Infuriating wire placement UX? We can keep going here.
If you say KiCAD is not an professional EDA due to missing live synchronization, the same argument applies also to Altium, Cadence Allegro, and most other EDA systems which are considered as professional by most people.