Flying wings also typically have a far smaller acceptable CG range compared to the conventional setups. Get outside that range and things go bad quickly. In some cases the flying wings also run into pitch damping issues... or rather LACK of pitch damping. In some cases this can lead to a resonant pitch oscillation that's hard to counter. And because with a flying wing a portion of the wing is acting like a stabilizer you'll find that you need to make then bigger and fly with a lower wing loading to get the same results as a conventional wing. This last bit is a simplistic way of looking at it. The real situation is that flying wings can't reach lift coefficients that are as high as a a regular design's wing due to either the reflex, washout twist or combination. Because they can't reach as high a Cl they need to fly faster or be lighter to allow similar speed range.

But as for the rest it doesn't really affect our models. We aren't trying to go anywhere for a minimal amount of fuel and speed is just a bigger motor or engine away.