It was slightly more complicated than that.
Orginally, there were decisions that the VAR could examine objectively (for example, offside) & tell the on-field referee that the player was off or on. Then there were subjective decisions - red cards, penalties etc.. Hence, pitchside monitors for the on-field referee to look & decide what had occurred.
Initially, PGMOL officials didn't use the pitchside monitors, trusting in the VAR officials to decide for them. That was against the principle of VAR & the managers/supervisors at PGMOL were very slow to ensure that onfield referees actually carried out their duties as directed. I suspect that PGMOL wrongly approached this in a 'softly-softly' manner to avoid discontent amongst the referees & has led us, in part, to where we are.