Yep this has been my experience as well. I'd add to that list - a power outage in the middle of a session. None of the staff knew what to do. Big open building full of stations, all active, all down mid process.

After the confusion died down and the staff had been told what to do, they were offering to continue or at least put the partially-centrifuged blood back. I said no thank you for the possible embolism and dipped. I'm an engineer. I know those machines are engineered very well, but I also know the limits of engineering and edge case testing.

Add to that 2 or 3 incidents years later where they wrapped my arm so poorly afterwards that I started bleeding everywhere after a few. One of those being a time I specifically asked them to be careful because that exact person fucked it up last time.

I don't strictly need it these days so I've stopped. But yep, just yet more indignity and danger for the poor, go USA!