Well, yeah.
From our POV, there are a lot more Saints than are on the calendar. That’s one reason for “All Saints Day”: it’s the “for those we didn’t mention or don’t know about” day.
I think the main reason for an “official” list is assurance. I mean, suppose some folks were celebrating “St. Pelagius” or “St. Arius”. That might lead somebody else to wonder. So there is a mechanism to provide some kind of assurance.
I’m spitballing. But that’s my guess.
Today we celebrate Holy Joseph. Now THERE is a GUY!
When you celebrate all saints day..you are celebrating all those that have Jesus as Lord..including me :)