I sent them the same letter about 1.5 years ago.
Interestingly, when i cancelled my subscription i was sure that i needed lossless streaming so the decision felt rational, but now 1.5 years later i feel just fine most of the time just streaming Youtube tracks.
So while i still like to see Spotify adopt lossless soon because in 2022 there is just no good reason anymore for any streaming network to keep offering lossy only, at the same time i don't really care anymore what kind of stream i listen to.
When you stop being compulsive about these things and just listen to the music, then after a while anything sounds 'just fine', funny enough.
The mind is a strange thing...