I’ll add my voice to those wanting this feature. I use Obsidian for (amongst many, many, other things) for writing books.
Having the ability to have each chapter, or even smaller segments, all in a single editable view would be incredibly helpful!
I’ve tried a number workarounds, but nothing has been reliable as yet.
As another person mentioned above, having multiple types of checklists in a single view, and able to edit them would also solve a lot of problems.
Or, as another helpful use case, I track various health indicators, and would love to keep each table, along with it’s chart-rendering code, in a separate file, while still being able to update them all without needing to open a bunch of different files.
The use cases are endless, and this really would be a massive win for Obsidian, especially if you are comparing it to other tools which have been able to do this for a decade or longer.