Sure, as someone who got paid to write C for many years I can't disagree it has issues - after all I no longer write C. I chose to write Rust instead.
The notable commonality of these "C alternatives" is that they are still moving targets and yet that wasn't mentioned.
True, C3 at least is one breaking release per year and between those there are non-breaking additions.
It's quite common for a project to pin to a stable version so this doesn't seem too unpredictable.