Well, that's a bit disappointing and depressing. I haven't been on Photrio for a while, but when did the expectation begin that handcrafted photography could be assumed to be as easy as using a phone camera?
Regarding your question about P.O.P., I'm perhaps the wrong person to ask. First I had to design a recipe. That did take a bit of time. I made the P.O.P. for the photographic materials testing at the National Gallery in D.C., with their requirement for high consistency. Again, not an afternoon's task. I wouldn't be interested if it had been. Boring.
I'm not sure I'm reading things right, but you may be confused about the difference between printing-out paper (POP) and developing-out paper (essentially all the rest of the silver gelatin types). A chloride paper (Azo or Lupex types) can be made with water, gelatin, sodium or potassium chloride, and silver nitrate -- in a Pyrex kitchen bowl with a stainless steel kitchen whisk. I'm not sure how it gets easier. P.O.P. paper is more complicated, but still not as hard to learn as many other processes.