I definitely can't argue about the size of their library! While the continued dragging of their feet on HiFi was frustrating (years of telling us it was coming), the thing which finally drove me away is their constant tweaking of playlist and queue management.

I mainly use their desktop client and controls would disappear with each update- no way to block songs, inability to remove a song from auto generated queues, playlists not syncing between devices, songs being weighted in a shuffle. I made a post on their forums about the missing options for their autoplay queues- their response was that while there was no button or context menu option to remove a song, I could select it and use the delete key. I just gave up on whatever type of user experience they want me to have.