If nothing else, C++ is worth a look for its excellent libraries that will not be replaced anytime soon.
It is great to see that the Nim community is more pragmatic and level-headed.
allthough... i can see reasons to avoid c++ in favour of other (systems) plangs but ultimately you will use whatever the team uses :D
CPP ecosystem is far from being sane in compare to e.g Rust.
For eg, if you just stick to Qt/C++/QML ecosystem for making GUI/Embedded apps, the libraries are quite good, the developer tooling is quite nice, you never even leave your IDE. Infact it is nicer than what Rust has to offer for GUI today. However, if you want to make webapps/services with C++, my experience has been death by thousand cuts. I have heard similar stories from developers coming from Windows/VC++. For a lot of them, cross platform portability isn't a thing to worry about. A lot of them just store compiled dlls and header files of their dependencies in their repos etc...
And until it gets bootstrapped, it will have a dependency on C++ compiler infrastructure.
You change company and you have to relearn all boring tools