To go back to original request...
While the autokey is a fun DIY project, that could very well work for some,
I believe the UI / Workflow is a final frontier for BIAB. Making UI and tools fully modular with pallet (panel) snap options will not only make program more appealing to younger audience, but would serve everybody equally well, as people would be able to use templates or arrange and save workspace and tools any way they want.

For example, not only the size, position and color could play a role, but also "complexity". To those with modest tasks a theme with less options/buttons, to more advanced users - full feature UI.

I imagine, it's not an easy task. However, I think there is a way to test concept on a smaller scale. For example, expand on idea of Tabbed MTP. In 2025 some new tools were added to tabbed block. Which would be OK, if you - as a user would be able to detach each tool, use it as it's own entity or simply don't display it. Personally, I would very unlikely use Lyrics or Splitter tabs, so in ideal world, I would detach, close them and save workspace. Another example that I keep on suggesting is have an option to remove Radio Bar. I have never used it, nor I ever will, yet it's there, starring at me for years.

Looking at bigger picture, some existing tools, such as Settings at the bar, Shots/Holds/Rests etc. could be made in such "detachable" tab panels and a user would be able to assemble their own tab clusters, or use particular panel by itself. But again, the key is to make UI fully modular.