Not sure what you're considering as "modern", but as someone why cut their teeth on C++ and still actually enjoys it, plenty of modern languages have their uses. It really depends on what you're looking for, but I've spent years in C++ and will still use python as a go to for small projects.

It's modern javascript/typescript you're talking about, isn't it?

They're an edge case IMO, and largely the issue is actually modernizing old languages. If you take something like Go or Rust as an example for a modern language, it's actually nice because the tooling is standardized for the language. In particular, the dependency management is built into the standard tooling.

Now you can always make it more complex by doing things like including docker in your build pipeline and maybe even creating pipelines that automatically deploy to kubernetes on a successful build... But all that is completely optional for like 99% of scenarios.