True, but it adds some flavoring to it. It's kinda like adding salt to a dish. You don't need to add it, but it makes the dish taste better.
To look back at G1, there were various background elements and characters that were not fully explored. But it's that ambiguity that made them interesting. We didn't need them for the narrative, but the existence of characters should not be dependent on a narrative in the first place.
Good storytelling has a background and ambiguous lore that doesn't necessarily need to be explored, but is available to those who want to explore.
Another reason to have extra characters is to sell new sets (in the unlikely hypothetical scenario in which LEGO says "yes" to all this).
P.S.: How was your trip?
P.P.S: This is from way back, but apparently Idris is a man's name. Welsh for "ardent lord". Real life example: Idris Elba.