> The vast majority of C programmers will agree that they don't care for any of the new features, as is clearly evident by the fact that almost nobody elects to use the latest standards.

I think there might be some mix between "we don't want any of the new features" and "we want the new features but can't". Probably hard to get good data on the precise split.

> A standard that can't be implemented is worthless, and even the "3 high quality" implementations of C/C++ haven't fully implemented the latest 2 editions of either language.

This is a bit black-and-white. Just because a standard isn't fully implemented doesn't mean the parts that are implemented can't be useful, especially if the "haven't implemented this yet" is more due to a lack of manpower/attention/desire/etc. than actual impossibility (e.g., libc++ and parallel algorithms/<charconv> vs. export template).