I like The 1975 but they got songs that are equally cringe as some of Arcade Fire's work.
Also, Win Butler is an abusive character whereas Healy is just a moron. Hell, Glasto had Axl Rose headline who's had credible sex crimes and domestic violence allegations.
He's been packing out large tents and outdoor stages at festivals across the world, as well as his own tours, so he'd fit very easily at Glastonbury. Could easily put him in Woodsies, or West Holts, or f**k it even an early afternoon slot on the pyramid and he'd nail it.