I understand what you are getting at but it is not fair tarring all service receptionists with the same brush.
Service Reception has to be the most difficult job in any dealership but, unfortunately, not all dealers employ people up to the job.
Yes they have to be salesmen but mainly they have to be good communicators with good memories and the capability of keeping track of everything going the workshop at one time.
From experience, most technicians make poor receptionists. We look for people skills first.
Unfortunately, too many service receptionists and service managers are ex-technicians who should never have been taken away from their spanners!