If projects like Linux stuck to plain and simple C then it wouldn’t even matter what GCC was written in. The fact that Linux doesn’t even try to do so, and that it is hardly unique in that choice, suggests that maybe “plain and simple C” is not so practical.

…the cure is worse than the disease. c++ is not a sane language, … it is NEVER the solution. I think it should not be taught anymore as its syntax complexity is toxic for mind sanity.

I’ll never understand the withering criticism of C++ on the part of C programmers and/or C aficionados. For instance, suppose we take everything you say about C++ as true, then what does that say about C? Virtually anywhere C++ is used C could be used as well, and every line of C++ represents a choice to not write C. In other words the insanity of C++ is seen by many smart and serious people as better than C, including by the stewards of every major C compiler today. Ultimately knocking down C++ to build up C does nothing but make the C community look like dilettantes trying to convince themselves more than anyone else.

The truth, as bitter as it may be, is that C++ genuinely scales and composes better than C. And C programmers know it too, at least on some level.