I cannot address any type of programming changes. I was addressing the fact that you stated, "the charts themselves are still suspect until HTC revisits them all" and "the listed weights for given charts some years back, and I don't know if they were ever updated back then either".
Neither statement is accurate.
As it stands, at this moment, the charts accurately represent the aircraft performance, in the game, given the data.
If you want to be able to pick some weight and have a chart drawn for that weight, then make that a "Wishlist" item. Inferring the charts are invalid is simply not true.