While I agree that the FCC will probably not go hunting someone down just to see what kind of a radio they are using, as others have said, the rules exist for a reason.
Now, with that out of the way, there are reasons I have radios that I could, should a need arise, use on both GMRS and ham frequencies. I don't currently have them set up that way, but a few minutes work on my computer and I could change my older Baofeng and Leixen radios from ham freqs only over to ham, FRS, GMRS and MURS. Having these radios is an asset. I hope to never have to use these radios out of their "legal" service, but it is nice to have the ability.
Same with having the 779UV. It is an asset to be able to make it do other work.
Hopefully, I will never need to do these things, but being able to do them is not a bad thing.