Ask HN: Developers, what frustrates you most about CMSs?

I've worked with various CMS platforms and have also built custom solutions for clients.

I'm working towards open-sourcing one of my builds, but I want to ensure it would be of use to others, besides myself.

To make sure I'm on the right path, I'm quite keen to see what problems everyone else regularly faces on a day-to-day!

So what frustrates you most about CMSs?

(there's no wrong answer)