Why should a home game GM even care what kind of Bad wrong fun PFS rules put in place, that's the whole reason its a home game and not a PFS game we don't have to follow the stupid PFS rules.most of the animals mentioned by others have special requirements and/or are not acceptable in PFS(and not on boons/chronicles) thus your home game GM should review them closely. Notable requirements; Dinosaur Druid archetype, the handler needs to be (or should be) an Orc or Goblin, etc.
Some familiars and possibly animal companions don't show on the lists in Archive of Nethys as their Bestiary listing backdoors them in as such. Soulbound doll (familiar) is one such entry (and is on a chronicle for PFS). I haven't finished running critters through my animal companion analysis and catching exceptions comes after basic analysis. It's likely I won't go looking for exceptions in animal companions.
that is your opinion and the way in which you argue only strengthens the reason for the guideline. The original poster stated WHY he believed it to be a requirement for wide acceptance on this particular topic.
Making suggestions that have undisclosed(hidden) significant strings attached borders on bad advice.
The OP (you) did no such thing, though you did suggest that it should be so with no reasons given. If you're saying that your current post gives the reason - that suggesting something without checking whether the PFS house rules forbid it borders on bad advice - then you should be checking whether each animal companion option is PFS legal, and you've said you won't do that.
TL;DR - unless you're writing a full guide or answering a direct question which said they wanted it, checking for PFS legality is wasting time.