Thank you! I just found your last blog post on the topic highlighting a few of the issues (https://tina.io/blog/evolution-of-inline-editing/). The solution you came up with looks exactly like what I had in mind!

Are these all the issues you faced? It seems like you mostly solved them, so I'm guessing there were others.

I wouldn't mind having to use the sidebar for secondary fields, I mostly care about the main content field, where I'd spend most of the time. Since (from a cursory glance) you seem to already provide components for rendering Markdown, I don't see a big issue regarding the coupling, at least for my use case.