

“apparently it’s a better safer C++, but I’m not going to switch because I can technically do all that stuff in C++”
The main difference between C++ and D was that (for most of the time in the past) D required garbage collector.
So, D was a language with similar Algol-style syntax targeting a completely different niche from C++.
Trying to correct your quote, it should read something like “I’m not going to switch because I can’t technically do all that stuff in D that I’m doing in C++” for it to make any sense.
Studying at a university is not a fancy job training.
Do whatever pays your bills, and learn what interests you. Sometimes the latter will help with the former, but it would be silly to depend on that.