True as a generic statement, as your nice little story illustrates. But the question is, does it, as you seem to be implying, apply to the "thing" we're talking about here -- automatically scaling an aircraft up or down in size and ending up with a still realistically behaving aircraft. I doubt there's any nice simple algorithm for calculating how all the aircraft parameters should change in relation to a change in aircraft size. It's probably just a matter of lots of trial and error testing in order to come up with tables of how each aircraft parameter should scale along with the aircraft size.

Anyway, I agree this is a desirable feature, and kudos to FSOne for being the first to implement it. I just think there are dozens of desirable features one could make a "I can't believe they released the sim without feature X" statement about, so it doesn't seem very productive to me. I've seen other people post that they'd never buy a sim without online multiplayer, or an aircraft development tool, or a "point of view follows aircraft" feature, etc. The company has to release a first version at some point, that's not going to have all the features everyone wants. Personally I think having very good physics simulation, and the ability to extensively configure the behavior of existing models, is the bare minimum for me to consider a sim. Other features are optional, but that's just my priorities.