BEC vs receiver pack

[REVO-DADDY]

Hi,
I am running a Novak HV system and I am finding the internal BEC to not meet my power requirements. The easiest solution would seem for me to add a reciever pack. However I see that most folks here use a BEC. I understand that weight is a factor, and the hassle of charging another pack is a problem, but are there any other advantages to bec over a relatively fool proof rx pack?

I ask because the HV system has 2 battery inputs, so I went out and got 2-2s lipos for it. What a mess of wiring I would have if I wired the bec to 2 batteries, you know?