+1 for any suggestions that make the characters look more fashionable.
Everyone wants their character to look as pretty as possible, that's the endgame of RO, and if there's a flying animation for SE, people will obviously want to have it. But the reality is that soul links are outdated skills, and in my opinion Union is just not worth using anymore. This'll only become more apparent in time.
It'd be a shame if we couldn't see this class flying around anymore, so just like how DK dragons and Meister mado display can be toggled with a command/settings npc, the flying option should be added as a toggle too I think. Or an alternate outfit.