Other than sounding sloppy, what are the other no-no's (if any) to creating sym links that span volume groups?

For example:
/myApp/file1 sits in appvg
I create a symlink to file1 that's located in rootvg's /usr/local:

ln -s /myApp/file1 /usr/local/mySymLink

This just sounds like a dodgy idea, but I'm looking for specifics on why it may, or may not, be a bad idea.