I don't think it has anything to do with being fashionable. I am not sure you realize this, but there are very few bands who can afford to do a full US tour on their own. When I started the booking process for this tour, it became clear rather quickly that the bands would likely be taking a much bigger financial hit if we tried to extend it out west too much.
It's understandable that a full north american tour is not a financial possibility, but I'm surprised even this small tour is feasible for a band who on this side of the ocean is only known to die-hard underground prog fans.