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.
That makes some sense for a show, but it’s kinda ridiculous for the Lego set. It makes it conspicuous.
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.
The whole thing is a bit of a storm in a teacup.