Not according to the FCC submittal -
First, the dual antenna system is optimized for CDMA1X/EV-DO on antenna 0 and LTE on antenna 1. But as long as only one antenna is in use (i.e. SVLTE is not active), the dual antennas can be switched at will to combat an RF fade at one antenna but not the other.
SVLTE is simultaneous voice with LTE data.
If that applies to your use, ok, fair enough.
But if not, please consider getting your phone checked, 3G and voice are routed through either antenna.
Hope this helps!
Btw, there are a number of threads and a video or two on this elsewhere on the internet. They're not active and you're the first Sprint user here mentioning this.