Not sure why Spotify won't make an EQ, but in the meantime, this one works amazingly well! The new version has 31 bands and it's easy to use and install. Been looking for a solution for awhile so happy to find it.
Here's the github: https://github.com/nodeful/eqMac2
I would have added this to another thread, but Spotify seems to be making some forum changes, so couldn't.