Xue Sheng
All weight is underside
I agree with that. Don't really know that the history is accurate, honestly can't say it is. Just dumping what was shared with me out so that we can have this conversation. Also appreciate that the story is shared as anecdotal in large part to just help explain the need for some of the principles of the art.
I think it's really liberating that we don't really know. It gives us some license to experiment with it and make it what we feel is most effective for us. There is something really beautiful about that.
I don't believe the art ever took the scientific method into account. I imagine not given its rediscovery/refinement in Western Europe. The same thing with other useful concepts like music notation, in particular rhythmic. I mention this in part because things like "proof by authority is meaningless" are useful concepts for making sure you dig to understand the logical physics-based proof for why what you're doing works to its most granular units of expression.
Rhythmic notation can be super useful too. For example, if we're talking about landing the foot just after the impact of a punch (I know there are different takes on this but bare with me) we can talk about the time in between the punch and the foot landing as being an 8th note. Then we can practice reducing time by decreasing length to a 16th note punch, 32nd note punch..., 64th note punch..., etc. That we ultimately want the time in between to approach 0 but that the punch land before the step (same could be said the other way around - foot landing before the punch).
I had a xingyiquan shifu who was also a musician and he taught things rhythmically. Also liked to watch his opponent and figure out their rhythm....and then attack on the off beat.
Experimentation within an art is a good thing, but if you want to keep the same name, IMO, you need to keep the basic structure of that art. Also take into account there are things that do not work today because of changes in other types of fighting and there are those things that do not work today because people do not take the time they need to better understand the art. Sometimes that is due to people being impatient, sometimes it is due to the fact that life is a whole lot faster paced today than it was a 100 years ago in China