My vets dont do anything like that behind the scenes either and its really not necessary anyway cos the cats all will be in cages and most walk into the carrier to come home unless they have to be lift cos cant stand.
I have seen both vets surguries working behind the scenes and can vouch for both of them. This is the modern way.
I am not strong enogh to hold a cat who is 6 kgs and the one time I tried to lift Sasa, not scruff, I found out how heavy and strong she is and she got away.
Both surguries have treated Sasa too and the one I use most managed to get her to walk out of the carrier by talking to her and then pick her up and stroke her while she was vaccinated and chipped and he told me that the most important thing is to get her back in the carrier before she gets to snap point and that was just as he was going to weigh her
The second surgery who treated her as an emergency when she had been bitten were stunning cos she bit the vet when he accidently hurt her by lifting her legs....turned out that was where the bite was and she was sedated and xrayed and given abs by injection.
I would not use a vet that scruffs