> Kubernetes works fine

At what cost? How many man-hours did it take? How many bugs could have been avoided? How much faster could it be done with other languages? Most importantly: if Google stops backing its development, who else could replace it?

Redis/SQLite are written in C, and it is also used by millions of people. They are also not known to be bad or full of bugs. You don't see that being used as an argument to claim that C is an "adequate" language for most people nowadays.

And if you did see anyone using that argument, we probably would say that this is just a lie they tell themselves to keep using C.