Can't agree with any of that Athonite.
There are certain jobs which may not be seen as flying instruction, but are part of the role. Briefings are cerrtainly part of the job though.
At most decent schools you should have support to help the program run smoothly. If you have to refuel, you aren't being efficient, if you have to process a payment, you aren't being efficient.
So a well run school shouldn't need you to do any of this, but if you do on the odd occasion, remember a school is a team and we all need to muck in doing a range of tasks to keep the show on the road.
That is what airlines are looking for, not some bolshy person who works to rule. Not my job guv'.