Who says they won't? They just published two new Tech Newsletters on the topic.
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Realize that HP cannot possibly test all papers available in all conditions in the ways that all of us will use them. Even Epson has a relatively short list of "tried and true" papers given that their 7xxx/9xxx series as been out for years.
Lest I sound like a champion for HP, I am not. I don't work for them. I don't own stock in them. etc.
I have been in computer graphics since the late 70's and a fine art photographer for over 30 years. I have watched digital systems evolve over a long time.
While I agree that HP did goof re. the marks on their own papers and I strongly feel that they should be responsible to test the most popular archival type papers but not every paper on the market. That may be more in line of the paper manufacturer in collaboration with HP or Epson or Canon.
It use to be that the paper manufacturers were responsible to make sure their surfaces and coatings worked with a specific set of printers. e.g Ilford's earlier gallery papers worked well with dye printers but created a gooey mess with epson's pigment printers such as the 2xxx series.
It is difficult to design an ink set that will print well on all types of sizings and coatings. BUT I do believe that this shouldn't be taken by HP or any one else (e.g. Canon or Epson, et.al.) as an excuse to create a technology set that is extremely narrow and require that the user use ONLY that printer's manufacturer's paper. That would be not only extremely arrogant of them but it would certainly destroy any chance for that printer to become profitable/successful.
my $.02