I can not think of a cognitively bigger language than C++. And I mean language, not library set or anything like that, but literally, what the syntactic constructs are, how they are defined, and in particular how they end up interacting with each other. I often wonder how many of the C++ defenders could actually answer detailed questions about it, or how much of the code they write would actually deeply, deeply surprise them with what memory allocation bugs are lurking, how much indirection there really is, or how many implicit copies of things they are making if they really took the time to step through the assembly language version. Or how many of them could bang out a decently accurate summary of the new official memory model, let alone how it might interact with all of the other features of C++. Or for real bonus points, successfully use it without introducing enormous numbers of things that are, technically, errors, but it so happens you never run into them at runtime.

Non-zero, I'm sure, but I bet single-digit percentages, tops. Except that last one, which I'd put money on sub-1%.

What are the odds that C++, as a fairly extreme outlier, is actually closer to optimal for the general purpose tasks it is used for than all the other languages?