Fix all the non informative error messsages
"The picture is too large and will be truncated",
"Too many styles",
There is a large selection in the clipboard..."
"Save as csv"...
modal error boxes in the VBA editor when a line of code is not completed.
and VBA error messages with error codes and no further explanations.
I don't think any of these error messages is helpful, they slow our workflow, and modern applications have a more graceful way of dealing with these problems.
This drives me up the wall and makes me consider alternatives to Excel. I get the infamous Clipboard error over and over and over and over and over until I want to do something I should not do. Why this has persisted for decades is hard to grasp. Totally unacceptable.