That solves one small part of the problem - viewing and editing the data in a UI. But can those tools address the problem raised by jasode?

> "I just sent you an xlsx where the rows highlighted in red are problems and if you can just add your notes to column K, that would be great. Thanks!"

This is a pretty common use-case, and neatly demonstrates a few of the reasons Excel is so popular. Sharing a self-contained DB with a colleague that they can view + edit with software they likely already have, modifying the schema easily on the fly, highlighting some rows. And that's not to mention the programmability - from having a simple "=SUM(...)" cell, to hacking some VBA or the newly introduced Lambda (https://www.microsoft.com/en-us/research/blog/lambda-the-ult...)

I wouldn't personally build anything important with Excel as a sort of DB, but I understand why some people would want to