Debate isn't bad.
That's how we learn.
There was a thread here awhile back where we had this discussion. Theh company Houndstooth is pretty much doing the same thing as an owner would be by scaling w/o anesthesia. I vaguely remember a story or two on that thread about how it ended up in disaster (or maybe a private vet had done it anesthesia free).
My vet would rather not use anesthesia also, but it is probably the best option for them in the end. We don't do yearly dentals. It's just not necessary for my dogs. The risk of the tartar is balanced with the risk of anesthesia, so a few litle spots with healthy gums = no dental for them. I a huge fan of OraVet and won't be without out. IMO, it's a healthier option for thier mouths.
Anyway, it's a personal preference hopefully based on valid research.
BTW, I would be drugging too if ellie had such an issue with SA. There is no question - quality of life first.