I have some more information for you. There are changes on the distant horizon. Will these take place within our lifetimes? Lord only knows.
"Poly(ethylene glycol) (PEG) is widely used as a gold standard in bioconjugation and nanomedicine to prolong blood circulation time and improve drug efficacy."
ncbi.nlm.nih.gov/pmc/articl...
"In this succinct review, we collate recent literature to draw the attention of polymer chemists to the issue of PEG immunogenicity in drug delivery and bioconjugation, thereby highlighting the importance of developing alternative polymers to replace PEG."