I've heard complaints against Spotify's library, but I've petty much only found really fairly obscure stuff to not really be there (excluding T Swift's infamous exodus). My main complaint with Spotify is their terrible autogenerated playlists. Other than that it's definitely the main place I listen to music and has effectively ended my music piracy.
Spotify lacks large portions of influential artist output. Last time I used it they didn't have three albums in a row I was looking for. I uninstalled it in a fit of pique. I would never pay money for a service that doesn't carry albums I want to hear when they are available digitally from Amazon.
They do, it's connected with having Prime. But a lot of their music that's available for download isn't for streaming. I checked them out recently and was disappointed.
Honestly around 75% of the time Pandora's playlists are actually pretty good. It'll never be as good as an actual human curated list (one of the best parts of Spotify is how many there are). I honestly haven't given Apple Music a shot. Long ago I realized that Apple only cares about experience on anything that's not a Mac.
Maybe it's my taste in music, but I stopped listening to Pandora years ago, before there was even a viable alternative because of how stale it sounded. No deep cuts, a lot of repetition, and the discovery engine was just terrible. I know I don't speak for everybody though.
No, I definitely agree with you. I stopped using Pandora something like a decade ago, but at my fiancée's work they have a business account so she got reacquainted with it and it's definitely better as far as algorithmic playlists go. Still can't compare to a curated list, but definitely better.