People who program in rust, do you still write c/c++ code?

I get that Rust is better in many ways, but that can't be it. C/C++ maybe a better choice in some projects where people want flexibility.

I've some experience in Rust, but I couldn't appreciate what it's offering. I'm about to write a distributed database in either Rust or C/C++. Will knowledge about C/C++ help?

One path could be implementation in C/C++ then conversion in Rust. But this would take (waste?) a lot of time. Other option is just learn what c/c++ is offering without building a real life solid project (shallow understanding) and build the database in Rust.

1. Is c/c++ experience a strong plus in Rust community?
2. How much would I lose by direct jumping into Rust?
3. People who use c/c++ alongside Rust, what are some benefits?

I want to follow the book "Designing Data-intensive Applications" by martin klepmann. Maybe I'm missing some points. Feel free to fill me in.