IMHO

I'd love to be able to consume my cymbal stream and share trough desktop, from browser.

Music is a kind of content to be consumed in a calm relaxed way. A pic, a gif, a tweet, are things you consume in a few seconds... but not music. A song is something consumed in a few MINUTES. Many times in desktop and not from a phone app. I rarely use spotify in my phone (I'd say 95% desktop - 5% phone). Also when consuming music (at least in Spain) in my phone, on the street, im pretty aware of my 4g data consumption (here flat rate plans are usually no more that 2gb per month) so htat other reason why it doesnt make sense for me to use it on phone.

For these same reasons id like to be able to share from desktop. the most typical use case form me for sharing would be: im listeneing a cool playlist/record on spotify. I like a song that i wanna share... I share through cymbal... but wait.... now i haw to switch from desktop (spotify) to mobile (cymbal)... thats a barrier :)

Hope this helps (and you understand my English :)