Really appreciate you taking the time to share this suggestion! 
I’ve thought about it, and decided to keep Planaria in its own tab for now — mainly because new users often discover plugins through the component tabs, and having a dedicated space makes it easier to find.
That said, I’ve also added a Planaria menu in the top menu bar and a toggleable floating widget on the canvas, so you can access it quickly without going through the tab.
Hope that helps! Let me know if you have other ideas.