Nope, it's not a consideration for me.
First, I don't buy the premise that an electric is just an acoustic amplified. I'm one of those arses who doesn't even believe in all the hype surrounding wood choice. Yes, I'm smart enough to know that the wood's mass and resonance WILL have an effect (two very dissimilar woods will produce different results); however, I don't believe certain wood choices make the world of difference that some people claim.
On top of that, though, and since we disagree on the above point, this is probably the one that I should simply be responding with ( ) --> the body itself will still have the mass of a normal Steinberger L-type guitar. Without the attachments, the rest of the body will look identical to an L-type.
The wings won't be particularly bulky, so I don't think they will have enough mass to dampen the vibration of the main part of the body in the event of a slighly weak clipping technology. After all, I'm not worried that my body and my soft, vibration-damping lap seriously undermines my guitar's tone when I'm playing from a seated position. If there IS any damping to be had (and I'm sure that scientifically speaking there IS going to be a little) it won't be any more than my soft body pressed up against a guitar would accomplish.
On the other hand, I do NOT believe that even with an awesome technique, that the 'wings' will impart any significant mass or tone enhancement to the guitar. I don't think they'll make it sound worse, but I don't think they'll make it sound better, either.
I've a very big believer in perspective. As a math teacher, one of the things we get to teach is the manipulation of data to present a strong case. I could take a graph of the time it takes for a guitar body's vibration to die out, both with the wings and without, and I do imagine that there could be a measureable difference, for sure. But on one graph, "zooming in" on the tail end, I could make it look like there's a significant difference. On the other hand, if I "zoom out" of the graph, you'd see how insignificant the difference is.
There could be all kinds of arguments, and you hear all kinds of voodoo around magazines, other guitarists, and this very forum, but I don't buy into it. It would not be beyond the scope of imagination that someone could say, "The wings will darken the tone slightly, but it'll be balanced off by a snappy maple fingerboard, and the pickups of choice will exert less magnetic pull on the strings, increasing sustain also." It's exactly the kind of thing that could be said, and people would buy it.
Greg