[shabble]

I don't think some sort of vaguely granular "last edited by XXX at YYY" annotations/tooltips/whatever would be too outrageous a feature to confuse everyone.

If necessary, could treat tables or other complicated compound entries as a single editable item, although given the mysterious passion everyone I've ever worked with seems to have for putting just about everything into a table regardless of need, I'd hope it could be granular to a cell-level, at least.

Trying to collaboratively write complicated documents with a bunch of inter-relations between sections, from different people (in my case, documentation & regulatory paperwork for medical devices) is a massive pain, and I feel like it's too obvious a problem to be confined to my particular niche.

I vaguely recall Word is widely used for preparing huge legal documents, where the content and stakes are probably similar, so maybe there are some solutions, unless they're just "throw interns at it".