Honestly, you’re actually not going to find much better for a simple multi-user setup than Ghost. It may have a lot of features built around newsletters and analytics that you’re not using, but the thing is, they’re there because it’s essentially throwing you the package it thinks will benefit most users, rather than forcing you to choose a bunch of plugins. If it feels overkill, that’s only because they wanted to cover the broadest use cases, rather than forcing users to decide on a package of 30 plugins, by a myriad number of developers.

I have used a lot of CMS platforms and I think you will find the complexity actually goes up from Ghost in most cases. (And if simplicity is your goal … you’re not going to find that with Drupal, which is extremely enterprise-oriented these days.)

If you think you’re getting overcharged for it, I’d recommend looking into self-hosting. Ghost is an extremely easy piece of software to run in a Docker instance on a shoebox somewhere. I do it myself for a couple of small sites. It’s really not that bad.