What a load of bullshit. Theo has had more staying power than the Rust community collectively to date as a maintainer of a mission critical OS. That's a lot of responsibility and I personally very much value his defense of what matters a lot to me: backwards compatibility. Not breaking stuff is the prime directive at that level. Suggesting that your rewritten, non compliant, non-drop in replacements and associated toolchain should be part of the default is hubris at a level that does not befit nor benefit the Rust community.

If you want to reach that level then you need to commit for real, and solve those issues that Theo rightfully marks. Even though this was written in 2017 it is just as applicable today: either you replacement is as good on all fronts as the thing it replaces and has some additional benefits replacement of something battle tested makes no sense.