I like a fair bit of Robyn and I love a fair bit of Jeppo, but I think the cult of fandom/standom that surrounds them is disproportionate and easy to explain.
I think both of them represent a return to an imagined ideal of pure pop that's seperate from what actual pop music looks like in the 2010s and today. A lot of contemporary pop music sounds over-compressed and brash, deliberately futuristic and abrasive. Lyrics about clubs and drinks and self-mythologising. Whereas Jeppo and Robyn hark back to a time when pop dealt with love and romance and a different kind of sexuality. You could picture them on a Saturday morning kids' TV show from 20 years ago in a way you couldn't picture eg Lady Gaga or Drake doing it.
Also the artists' own narratives allow for a certain projection of coolness. Jeppo is 35. She's not an 18 yr old in sportswear being marketed as cool and edgy: the vibe is more of a hipper, idiosyncratic listener, a figure whose own age and sensibilities feel more relatable. Manic pixie dream girl as pop star.
Both of these factors allow acts like Jeppo and Robyn a level of credibility - they're not like other pop music, this is the stuff that it's OK to like. This isn't to say that they exist in a seperate listening universe from Top 40 pop, nor exclusively to the world of chic anti-fashion coolness. But it allows them a respectability that you don't find awarded to Ariana Grande or whoever.
Which is really sad, because
a) a lot of pop music is in really great health just now - Tove Styrke, Tove Lo, Charli XCX, Annie, Taylor Swift etc, all releasing music lately that's really good but not afforded the same broadsheet column ink
b) Robyn's biggest songs are all "Dancing On My Own" photocopies
c) Jeppo's quality control isn't there - there's some incredible stuff in her catalogue but half of E.Mo.Tion and a lot of Dedicated is anaemic, wishy-washy stuff that doesn't reach the heights of Run Away With Me or Call Me Maybe. Dedicated was a massive disappointment considering how much I loved the first two albums.