It's good software engineering. The reasonable case for multi-person editing of a document is several people at the max editing the document concurrently. Hav

It's good software engineering. The reasonable case for multi-person editing of a document is several people at the max editing the document concurrently. Having thousands of people doing that is not a real-life scenario. It's better to protect yourself from extremes like that by disabling editing functionality in that case than try to engineer a system that actually allows thousands of people editing a document concurrently (because it would be very expensive in engineering time and especially testing time). There's literally no business case to be made for supporting thousands of concurrent edits - no one actually needs that functionality.