So this does beg the question, if these are a benefit of Polaris why do UA not place them (slippers and gel pillows and PJs for the appropriate flights) at every seat just like the blanket, ear phones, non-gel pillows and padding? At the end of the flight they could then come through and collect the gel pillows if they are concerned people will take them. Many OALs come through at the end to take back the earphones so not unheard of for airlines to collect an item in J.

I would rather UA provided the gel pillow than the regular pillow for my flights (although do use the regular pillow to provide lumbar support on some seats).

I just received an ETC as there were no slippers for my most recent flight but think it would have been cheaper for UA if they ensured these were provisioned and provided to each passenger at the seat rather than asking the FAs during the boarding process. I do ask during the boarding process (PDB service) as in the past they have run out of the gel pillows.