I don't know for sure what Canon means but based on your elaboration, yeah. I do like the speculative specific event ones sometimes, but sometimes reading those the authors get wrapped up in it and some audience too and they almost act like that actually happened and it's tiring. I mostly like a mix. I don't want to read about Suho as a cafe barista or anything, but I do prefer things with some imagination, so that you don't really have specific events mentioned, it's like they are a band and they do concerts and it's about their idol life, but not specific really, not like mentioning specific dates and events so that it's clearer to everyone that's it's fiction and it's also cool to see what people do, with more free reign. That's where I also draw the line for ship fictions. Original characters make me uncomfortable so I like reading idol fics so that there's an actual name and face, but I don't want to connect the story to that name and face in real life. I prefer a clear alternate sense while still not bring unrealistic. If that makes sense.
For me personally, the idols should be a vessel for the story rather than the story a narrative for the idol.
My one acception is school/student fics, but I mean idols do go to school (though not in the way portrayed in those fics) so maybe that's why it's an exception? Who knows.