But … I don’t?
I download and install Spotify.app on my computer (at least my gf does on hers, I use Apple Music). Maybe I am the weird one? No I am not, I skimmed the Spotify subreddit and most use the app on PC/Mac: It has keyboard shortcuts, people find it nicer being its own program instead some browser tab, it is more lightweight, it provides offline play and crossfading and has (freemium and paid) higher bitrate than web. It is you who are missing out.