I learned it myself while at Uni because we only did C and Java.

I d say it s important to learn a bit just for the C with classes aspect. Sometimes you want to do a moderately complex C program that Java dev will have to help with, and it helps knowing C++ (as in: I did a 3D engine in it, using no overly fancy language feature, for me that s good enough to get an ability to produce something useful enough).

It's a bit sad Rust and Go are so far from C. Might as well just go to Java, a paradise for team work and problem solving.