Seconding the question. More to the point, a language that only needs libc and not a separate runtime.

It's a big boon that existing C projects can migrate one object file at a time to betterC, without needing to pull in extra dependencies. Moreover, embedded dev is where C is still the most entrenched due to its runtime simplicity (simple ctr0, linker script, and you're off).

You can certainly treat it that way. It specifically does not need its own libraries, all it needs are the usual C libraries. Libraries created with it are also directly accessible from C.

No. D already has image problems with D1 and D2 (as in people crop up on the forum asking about it a decade after the switch), making D better C a separate language probably wouldn't be a great idea