From my point of view, however, the high quality designs from the prequels are being ignored in favour of designs from EU/'Legends' sources that are of a much lower standard. And that is a shame.
By which you mean what, the TIE Defender, Phantom? the YT2400? HWK?
Though I know that a lot of these ships have a quite a bit of history attached to them, I just think that they are not designed as well as what appears in the Star Wars films - any film. Specifically, I'm thinking of the TIE Defender, E-Wing, Z-95, HWK and yes, the Outrider, too. They either don't communicate something, are derivative, or both.
Star Wars is for a large part about archetypes that talk to us on an emotional level. Good design does that, too. This combination is part of what makes the films big, but it required significant skill. I think that skill was not always present when all those spin-off products were made. It's like the difference between an Alvar Aalto or Rietveld chair and an original IKEA design - when you see it, you get it that one is made by a better artist and the other by a lesser one. Good design affects the viewer, and in Star Wars this was done in good harmony with how the movies were supposed to work. The effects, the designs, the action - everything made the viewer feel certain emotions.
Don't get me wrong, I like all or most ships in the game; my HWK flies fine (and looks nice regardless of comparisons) and I do build squads with E-Wings. But the difference with the films' designs can be seen, and I'm convinced the miniatures would improve if the prequel ships were included. The look of the minis is an important aspect of enjoyment of this game, so I think there is something to be gained here.