Gotta say I’m surprised to see Spotify adding something people actually want. It must be getting rough for them.
I might be out of the loop. Who wants this exactly? There is no audible benefit from lossless audio. I rip all my music to lossless files but that’s archival. There’s nothing to archive with streaming services.

I want this, and although there isn’t always a perceptible difference in audio quality, there sometimes can be. It depends on the content, and I’d rather sometimes stream audio at an excessively high bitrate than always lose the high–end definition that I could have enjoyed where it exists.

All my life I’ve been getting into disagreements with people who believe that because they can’t tell the difference between A and B, I must not be able to either. I find this immensely frustrating.

I agree. I can definitely hear a difference, mostly in the rhythm section and low end.
You can hear a difference between 320 kbps mp3/aac/vorbis and lossless? Can you prove that with an ABX test?
Eh, I got 40% on 2 tries. It’s something I guess. Either way, why not take the higher quality version if it’s included?

So quite literally worse than a coin flip, then.

Streaming lossless audio will use up three to six times as much data, along with the higher processing demands to play them back, so there’s always a penalty involved. We didn’t invent codecs for no reason.