What's wrong with C++? Seems unfair to compare it with JIRA.
The idea that the C++ committee are unthinking people pleasers it patently false.
C++ does have a lot of cruft, but mostly because it aims to: i) support new features ii) maintain pretty strong backward compatibility guarantees
In general the new features are actually pretty well liked, but in conjunction with (ii) it creates a big language. There's a reasonably decent subset that can be carved out, but it's also clear why newcomers without legacy baggage (e.g. rust) are making inroads.
EDIT: clarified wording a bit.