My argument is only that starting with the proportion and metrics of Roboto and not changing them means that what you will end up with at best is a marginal improvment over Roboto. If "marinal improvement over Roboto" is what you are aiming for, great, but don't oversell it or your work will be dismissed in the same way that I did in the original post. There are myriad solutions to how letterforms are created, and it isn't a foregone conclusion that these forms are or will continue to be "the best".