So much of Anon discussion is Personal Opinion with No Sauce, because there is no sauce... it's just for discussion's sake that we posit theories.
I think PONS sounds stupid. I like PNSO, or Personal No-Sauce Opinion.
I will be using PNSO whenever I share my opinion, theory, etc. based on context, instinct and other non-verifiable inputs so that other Anons know it's not supported with sauce.
Feel free to use it or not.
A huge part of understanding how the world works is in being able to discern the difference between what is a fact (AKA a report of an event) and what is opinion or speculation presented as fact. I think that we shouldn't have to advertise what is opinion or speculation with acronyms or any other explicit statement, rather, people need to learn for themselves how to tell the difference. It is an essential skill to have.