Schiit Freya plus. Is this an upgrade?

I'm considering the Freya+ to replace my Onkyo P-3000R preamp. The main reason is the Onkyo doesn't have balanced outputs. ATC that makes my amplifier highly recommends using balanced whenever possible. I emailed Schiit and they responded quickly saying the balanced should only be used for monoblocks and that I should use single ended. I'm sure they know what they are talking about but I'm just wondering if any of you can explain why this would be. In other words why I shouldn't use the balanced outputs of the Freya+ into my amp. Just trying to educate myself on preamp/amp compatibility regardless of which brand I use

I think they say this because you HAVE to have mono blocks in order to use balanced with THEIR amps. Vidar and Aiger only have one XLR input.

I use Balanced with my Bryston 4B3 with zero problems. Not sure where this is coming from. Running the Freya Plus for 1.5 Years