I think that in both types of use cases it is important to know that things changed, but when loading in a newer version, some changes are not as critical as others. I don't usually save the changes, unless I relink a lot of VIs and want to over them and make sure.
How about these improvements:
(1) Do you typically read this warning dialog in detail? Do you scan over it looking for particular types of warnings?
(2) Do you use the "Save to File..." button to export the warnings to a text file for later examination? If so, do you use any automated tools to parse/filter these text files?
(3) Does this dialog ever appear at times when you really would rather it be suppressed? Is it ever essential to suppress this dialog?
1. Depends what I'm working on. Sometimes I read it in detail, sometimes I skim it over. However, the *format* of the information is *very* tedious to read. It'd be great to be put into a view similar to the Windows Explorer "details" view. Different aspects of the information are in different columns and you can click on a column heading to sort by that particular column.
2. If the list of warnings is long, I definitely use the "Save to File..." button for later line-by-line scrutiny. I don't use any automated tools to parse or filter that file.
3. No, I can't think of a time that it ought to be suppressed entirely.