I'll grant that PHP is set up to allow some super shitty code, but on fairness to the language; WordPress is a dumpster fire (compounded by endless awful plugins). That's compounded by it's ubiquity, so it's a massive target.
I just set up mbin as a single-user instance, and other than a bug I found (that they fixed live with me, in chat, including PRs), it's been awesome.
I hope your instance continues to work well for you 👍