Embedded: But how is that an argument for C++? I can do safe stuff in Lua without the hassle of C++ & then use C when needed.
Parallellism: Agree. Here we have a case.
Scientific: Yes, someone needs to write the underlying libraries for Python & Matlab, but if you are starting a new project, do you actually start writing a library first or do you use an existing one?
IDE tooling: Yes, good tooling can be a good argument in itself to pick a technology. With C++ maturity is as a clear advantage, however some of the languages that i listed do have quite nice tooling today, e.g. C# & TypeScript.