Recently I was experimenting with a Launchpad and a RN2483 pictail board. Due to my powersupply configuration the RN2483 did not respond on the serial lines until I pulled the reset line to 0V. I assume RN2483 can stay in reset if the powersupply was rising too slowly or is unstable.
On things uno the 3.3V powersupply can also power external circuitry causing unwanted behavior on the RN2483.
Perhaps a hardware reset is a nice to have feature on the things uno boards. The implementation is a little tricky without extra components. I think a FET should pull the /RESET pin of the RN2483 to 0V. Evt. this reset feature could be selected using a jumper.