Godot 4 developers: What's been your biggest UI development headache?

I’m researching a possible paid resource for independent Godot developers, but I want to understand actual problems before building anything.

If you’ve recently worked on a game’s interface, I’d appreciate hearing about your experience.

  1. What specific UI task took more time than expected?

  2. How did you eventually solve it?

  3. Have you purchased UI assets, themes, plugins, or custom design services? If so, what made them worth paying for? If not, why?

I’m particularly interested in real examples from projects rather than hypothetical feature requests.

No product to promote. I’m trying to understand which problems, if any, justify a commercial solution.