WordPress is not underrated in fact it is overrated. It can get messed up easily or get hacked anytime if you're not careful. Also, you need at least some technical knowledge to make it well optimized.
A blog on Medium is not yours, it's their platform and they do delete blogs for minor issues. I had one taken down few months ago but it's nothing important so I don't care.
BTW, did you know Evan Williams is the co-founder of Blogger, Twitter and Medium. Yes, he helped creating 3 massively successful services which still exists today. Fuckin Legend!
Blogger is by far the most underrated blogging tool ever. Just add your custom domain and a professional theme and you're ready to run with SSL. It's quick, already optimized, everything is in place.
You want to edit robots.txt, ads.tx? it's just there, you need to add analytics? It's there in the settings, you need to add more authors? It's there. Just send an invitation by putting their email. Fast and easy, you need to add to search console, it's automatically verified. No extra steps. You basically just write, that's it.
But there are some limitations, you can't publish thousands of articles automatically, can't add plugins, can't change URL structure. But that's it. It's an insanely good deal for something that's free.