I don't understand what this is doing. Can't you sideload any ebook onto a kobo anyway? Never had an issue on my Clara

I’ve noticed that people today often bristle at any suggestion that one connect a device to a phone or computer with a cable – on Reddit, one will often get downvoted for this. Apparently, a lot of younger people are hardly aware this is possible and it strikes them as overly complicated or for old people. People want to wirelessly transfer stuff, and what the OP linked to is a popular way to do that with Kobo.