Also, your point wasn't that there was a single timeline that ATLUS was following, but rather that anything that wasn't being directly carried over or expanded upon in later games wasn't worth playing.
Not worth buying P3P if you've already played through FES. That was my point.


That because in Persona 4 Arena and Persona Q, the main character of Persona 3 is male, the female main character story doesn't count. Similarly, I guess, Marie's story in Persona 4 Golden doesn't matter, since she wasn't mentioned, nor were any of the events in her story.
Marie is in Persona Q, so she is most likely canon.


I guess we can assume that Yu didn't max the Social Links with any of the Investigation Team, since none of them had their final Personas in Persona 4 Arena (even Teddy, who you have to max to beat the game).
I believe that Atlus has stated this was a design choice rather than a plot element.


I guess that Yu didn't romance anyone, since there is no romantic indications given in any of his interactions in Persona 4 Arena.
Nothing is said either way. It's left up in the air.


You (Bright Shield, that is) seem to be extremely focused on what is canon and not, and it seems to me that you think the only content in a game that matters is the content that later ends up canon (but excuse me if I mistaken about this).
Not saying that at all. I get every possible outcome, so I can see everything. I was saying that I don't think P3P is worth it if someone has already completed FES. This is due to P3P missing a chunk of the canon story, and replacing it with a filler scenario. Not worth it to me.