I'm not so sure that this first video accomplishes what it needs to or intends to. The problem is that guitar tone will be a function of mass and especially mass distribution. Mass has a special relationship to bridge location, insomuch as the mass surrounding the bridge determines the manner in which the guitar conserves or absorbs energy in different parts of the spectrum. If you want a clear demonstration, compare semi-acoustics with and without center-blocks. As well, I find that guitars whose bridge is closer to the "waist" than the "hips" of the body tend to lack deep bassTwo very important videos proving that the wood matters.
1) Pretty straight forward, no explanations needed:
Completely agree with this portion of your statement.As I have argued to statistician-buddies over the years, the "sin" is never the measurement method used, but rather the extent to which the inferences drawn are supported or justified by the measurement methodology used. Personally, I think wood does matter. But so does drying, chambering, finish, bridge mass, fingerboard material, and how/where the neck is attached to the body. I would hate for anyone to think that a given tone can be achieved simply by choice of wood. Not many are that naive, I suppose, but perhaps I underestimate.
None of that is to lambaste those who try to demonstrate wood properties. It is one VERY tough row to hoe, as they say.
To me that is not a separate variable as I explained above. Part of the difference of one species to another is density, which means for the same body shape/size there will be a weight differences. Mahogany will be lighter than maple most often - that's a valid comparison to me and part of the package because guitar builders do not select for density/weight, but for species and aesthetics within that (sometimes).The "bodies" used in the video are certainly of comparable dimensions and such, and given how small they are, they are unlikely to vary much in terms of weight. So, kudos in that regard. Like the Warmoth video, he has tried to rule out as many extraneous variables as he could. But the very small weight differences are likely to be magnified once one scales up from that size to a full-body guitar.
Which is why we will likely have to wait a while for any sort of definitive answer. Bring a lunch and a change of clothes. Maybe some pajamas.The way to improve the tests is either to , as you say, try multiple bodies of each species to get an average of sorts OR, to select a piece of each species that is the most plain, with the most consistant and typical (for that species) grain - like no knots etc.