I wave but where I live I have noticed if you do not have ducks lined up all over your dash pad you don't get a wave back. The duck thing has really a big thing around here. I would say 80 percent or better have the ducks.
It is really not my opinion, just a fact. The requirement you are referring to is for commercial vehicles. If states had a law requiring your Jeep to have mud flaps it would come equipped that way from the factory. Enjoy your mud flaps
There is not one single thing that one could do to a Jeep that would detract more from its overall looks and general appearance and that would be to install mud flaps. It is not just my opinion either. I can see more than a hundred jeeps go down the road before I would see one with mud flaps...
That's your call. But just for the heck of it see what the specifications are on the container your brother use to top it off and compare it to what Mopar recommends.