What on earth are you talking about? I was talking about OP's post, the point of this entire thread. OP was pretty clear about going in for a session 15 minutes late due to the practitioner's lateness, and getting sent out 5 minutes early due to the practitioner's choice. So no, it wasn't an assumption that it was not client-caused delay, and no, it wasn't an assumption that the session was cut short.

OP also clearly said (s)he got no apology at all. So it wasn't an assumption to say that communication was lacking.

My point about billing insurance is that you can't claim to be offering sessions of a set time and then only providing part of that when you work in a clinic, so it shouldn't be different if you're working in a spa. I apologize that that wasn't clear, I did assume that context clues would make that clear to the average practitioner but I should have spelled it out for clarity.

For delays caused by the practitioner, the burden is clearly on the practitioner to communicate. Assuming there was no such communication at all, and the client was short-changed without further accommodation, there is really no argument, the fault is clearly with the practitioner and there would definitely, not arguably, be an issue of bad faith.

This is the entire point of what I wrote. You attacked OP on the grounds that sometimes you get farted on and don't get an apology, and for not praising a therapist you just assumed has relevant, praisable attributes.

You also don't talk about all those times you got a few minutes extra. You don't mention all the times you received scheduling flexibility. Do you tip extra when you get those benefits?

I understand you want to vent, but what did you really want, a discount, some extra time, a gift card, a refund? If you really wanted an apology, you would have asked for one instead of making the person guess. You don't strike me as the type of person who is shy about getting what you really want.

Talk about assumptions! OP didn't mention a single one of these things in their post, and in fact specifically said all they were interested in was an apology when their therapist runs 15 minutes late to pick them up. It sounds like you might be projecting your own client-therapist conflicts onto OP. There's no reason to assume OP gets extra time, gets special scheduling accomodation, doesn't tip, or is grasping for financial gain.