npm is a package manager though, not a build system. If you use a library that has a dependency on another library, npm downloads the right version for you.
Yep. And so does unpkg. If you’re using JavaScript code through unpkg, you’re still using npm and your code is still bundled. You’re just getting someone else to do it, at a cost of introducing a 3rd party dependency.
I guess if your problem with npm and bundlers is you don’t want to run those programs, fine? I just don’t really understand what you gain from avoiding running bundlers on your local computer.