Yeah, those are all fair points. We've been using Jitsi for work with pretty much no problems, albeit in group calls where video and audio quality don't matter too much. Someone below gave some good recommendations for hardware as well.
The helpdesk issue.... IDK. If Jitsi works, it is incredibly easy to use, right? Basically just, click this link and you're in. (If does some heavy lifting there, I know :D)
Yeah, I am havong mixed feelings about this. But at least during Covid, it was apparently the norm, so it must work, somehow...
I could find a teacher closer to me, but for one thing, I only have a boke available, and biking ~10km with the cello on my back is not something I look forward to doing on a regular basis. The other thing is that I consider this teacher a friend, she's given me lessonsfor more than a decade in the past, and I know we vibe well together.