What's Tidal's killer feature?

I've used Spotify, Deezer, currently Youtube Music because bundled with my premium. I don't like it, I'd like to move, but I'm not sure I can tell why Tidal would provide a better service that's worth the hassle of importing all my playlists. They're all a little crap in their own way.

FLAC audio is cool I guess, but honestly that would not be a good enough selling point for me.