I don't really care about unofficial solutions. Flatpak package which is available in Flathub use unofficial repo. This is not a solution for me. I would like Spotify to provide official Flatpak package as they provide official exe and dmg.
You're right but this version, originally developed for Ubuntu, allows me to have a Spotify client compatible with openSuSE without having to try to rebuild a*.rpm from the Ubuntu*.debversion by converting withalienutility (or to use another risky tip?). So I found this version useful for me.
However, if Spotify develops a REAL version for all Linux distributions, they should useAppImage rather than Flatpak because it's much more adapted to this type of application.
I'm testing openSuse Leap 15.0 [beta] with KDE Plasma 5.12 desktop. With this distro, you can use (KDE Plasma) Discover. You have just to add the Flathub repository for Flatpak in Discovers's parameters. Wait for updating packages list and you'll can install last version of Spotify client with.
When Spotifify client (Flatpak) installation was finished on my Leap 15.0, the Spotify icon was not correctly displayed in Plasma menu, but it was fixed after restarting the system. With the v1.0.77, the "personal music folder (bad) path" bug seems fixed, at last!