Are they? Where have you heard that? Recently Calibre was updated to convert things to kepub when loading to Kobo devices - see https://www.omgubuntu.co.uk/20

Are they? Where have you heard that? Recently Calibre was updated to convert things to kepub when loading to Kobo devices - see https://www.omgubuntu.co.uk/2025/03/calibre-update-convert-kobo-kepub-files https://www.omgubuntu.co.uk/2025/03/calibre-update-convert-k... - but I haven't anything about Kobo itself doing anything to improve this.