CaptAirprox.
going back to a point you made a few days ago. This relates to an adage used among some of the old school of ATCO's that never use speed control when vectors will do.
It of course simply doesn't work in a busy traffic environment, but at quieter airfields many controllers don't have to sequence and have never learnt anything else.
Fam Flights and Crew visits of course would help many of these problems to be sorted.