Well that, I agree, would be dumb.
I like this kind of thing! Minimal code but very elegant from a UX perspective. The oh but you could just mv foo-{bar,baz}.txt crowd is completely missing the point.
I disagree. I think a better way to think about things is, "can I accomplish my goal most of the time using the standard tools without writing something custom?" I'll be the first to admit that there are a ton of things in the shell and in coreutils that I don't know about. I bet I've written several scripts over the years with custom functionality that could be replaced with standard tools I didn't know about. That's the thing that I want to avoid.
But please please please please with all the love of America, baseball, and apple pie, don't change the default behavior of basic unix commands.
Otherwise you force people into writing nonsense like this:
MV=/usr/bin/mv
${MV} ${FILE1} ${FILE2}
God help any user that's on a shared system whose sysadmin thinks this is a good idea putting in the default /etc/profile.
To be fair, I don't feel like I'm being pedantic. I'm anti-footgun.