It comes down to this:
Powered frogs served the pre-DCC era of analog running where whole train length track sections (blocks) were gapped and turned on and off via toggles to have independence of trains..otherwise all trains would move when the power pack was turned up and stop when turned down...
So switches with powered frogs assisted that activity by, depending which way points were thrown, would isolate/stop/house a train in a spur or siding while the other train was running, by shutting off power...
Today, with DCC control that kind of frog/points activity is no longer needed for independence of trains...BUT, if, IF you have short wheel base locos such as 0-4-0s, 0-6-0s, or 4 wheeled diesel switchers which stall on unpowered 'all live' switches, then you may want to power the frogs of switches where they stall...
Otherwise, NO, in DCC you do not need (power-routing) powered frogs if you can help it.....Unpowered (all-live) are fine for DCC...