I don’t think such a critical review of a tree and purveyor is fair when based on performance of any variety from a single season or even at a single site. I have noticed quite a range of quality of same variety apricots at various sites that I manage. In the end, quality of cots is mostly about sugar and juice, IMO, the aroma of orange cots seems to be fairly consistent here.
My experience is that patent descriptions of fruit quality aren’t all that reliable either. Also, a lot of Zaiger varieties are bred for shelf life and sometimes, as with pluots, that means the trees build up sugar well before becoming soft ripe which can be a nice asset. Not too crazy about peaches that remain hard on the tree forever, though, but I’m thinking of White Lady- if it had some acid in its profile, I might enjoy eating a sweet crisp one.
I think you should give the tree another season and wait for other grower evaluations before declaring war.