I finally decided to migrate from Wordpress to Hugo, to simplify the entire site administration. I'll keep using MarsEdit to publish all posts via Orbit, which is a MetaWeblog server for Hugo.
One of the reasons I moved from WP is security. Even if WP keeps getting updated constantly, the risk of being pwned is high, and I don’t want to babysit it. Another reason is I see lots of requests in the web server logs related to WP, such as wp-cron.php, wp-login.php which frankly is too much noise for things that don’t amount to anything useful in my use case.
So far I quite like Hugo. I automated some of the process of publishing using shell scripts and rsync. It seems to work great so far.