JMS has been trying to distil and bottle it unsuccessfully for years. He told an amazing five-year story over B5's first four seasons*, but then each time he goes back to tell more stories in that universe it becomes more and more clear that he can't come up with anything capable of standing next to what he's already done there.
*Context: they crammed the planned s4 and s5 into s4 because they thought they would get cancelled, but then they got unexpectedly renewed so JMS had to write what was effectively an epilogue s5.
It's very binary in the Disney era. All the theatrical movies, the 2008 Clone Wars TV show, Rebels, and all the rest of the Disney-era TV shows are canon, as are all of the novels, comics, games etc released during the Disney era. Everything else is non-canon. Lucasfilm maintains a tight grip on canon and that's a big part of what Pablo Hidalgo's job is all about.
Before the Disney-era, the concept of canon in the Star Wars Expanded Universe was more complicated and fluid, and relied on 'tiers' of canon with the movies at the top, the TV shows next, certain novels next, etc. The idea of canon back then was that anything in the one of the lower tiers could be canon as long as it wasn't contradicted by something in a higher tier. For example, if somebody wrote an EU novel that said that Anakin loved sand, that would be non-canon because it's directly contradicted by Attack of the Clones; but if they wrote a novel that said Padme loved sand, that might be canon if there's nothing in the higher tiers of canon to contradict it.
I think for the Lego set it's more that the average casual fan is more likely to recognise the name 'Boba Fett' than the name 'Slave 1'. They're a commercial enterprise and they want to sell these things to a wide audience, and marketing it under a name that was never mentioned on-screen in the movies wouldn't exactly make that easier.
He didn't steal it. He took it to give to Spock's son, who Kirk took to be raised by Spock's family on the desert world of Vulcan for safekeeping ... High ground!
But the same communities can exist on multiple sites, and it's confusing to navigate all of that.
I mean, on Reddit the same communities can exist on the same site. I'm a member of r/europe and r/europes, and of r/introvert and r/introverts...
Federation isn't the cause of competing communities. What happens on Reddit is that eventually enough of a mass of people congregate around one sub for a topic, and that becomes the de facto main one. The same thing will happen here.
Whilst I love this, you do realise that 25 December is the first day of Christmas, not the twelfth? So the Twelve Days of Christmas run from 25 December to 5 January (which is why it's considered bad luck to keep your Christmas tree up after 5 January, aka 'Twelfth Night').