Sevilla have changed considerably since their last Europa League win (2016), let alone the 2014 one, so I don't think those achievements are hugely relevant for today's team.
Yeah it does feel like Roma are there to make up the numbers (I recall a similar run by Schalke some years back), but in terms of stopping Real, I'm not convinced this year's Barca would be able to do that (in the CL, they did spank them in the league).
Still fancy Bayern, can't underestimate the Jupp. But absolutely in agreement with you, very refreshing storylines. I'm still a bit pumped after watching the end of the Roma game.