RT
Melania,
I am not a vet, but have owned goldens for decades and am on my 5th one right now. Goldens are cancer magnets, an oncologist told me their life span now is around 10 years old so you are ahead of the game. My other 4 goldens all got cancer at around 11-13+ years old. Every one of them developed skin issues and cysts at an older age, around 9-10 or so and they were not on any medications and had no prior skin issues.
It may be a result of some of things you mentioned, it may also be genetically related. I believe there are many very poor breeders out there which contribute to some of the health issues in dogs. They are breeding dogs with chronic health issues and passing it on down the line.
Anyway, you have an old dog, if it were me I would just want to keep the dog as comfortable as possible and provide relief however I could and if something like Cytopoint gave her relief I would not hesitate to use it. At her age, quality of life is certainly more important than length. You just don't have the time to try things that may take a long time to be effective.
I'm not trying to step on Dr Falconers toes here but you asked for any advice and since no one else responded thought I would share my own opinion.
I appreciate what Dr Falconer is trying to do, but sometimes we just have to do what we think is best and age is a consideration when trying to determine what to do to help out furry friends.