For MS, an edge case is something that probably has under 100k users unless someone on the dev / feature team decides to champion that item.

So no - some of your examples are very much edge cases, preference, or lack of understanding how MS works.

Example(s) off your list: item #4 - that's subjective and I am certain there are users that do want that feature. This same feedback probably applies to #3 also. Or not enough people care / complain about #2 and #3 to get them prioritized.

#5 and 6 is probably because people tend to think that MS is one unified company; it's more like little ones that group together to produce a product. The Excel and PowerPoint teams pre-Satya wouldn't have even talked on features outside of integration testing. That item also might be a PowerPoint issue, a Windows OS issue (for how the formatting gets preserved on copy) and not related to Excel at all.

The VBA item someone else has already addressed.

MS dogfoods heavily; it's just that MS doesn't represent their user base (hence the push for insiders - as insiders may represent the user base). I think most large companies (Google, Amazon, etc) that make software have that same issue (lack of user base representation internally).