[dub]

Being familiar with npm doesn't save the time it loses you on its clunkiness. I see for myself and other engineers around me that we waste real time every week clearing our yarn caches, waiting for "yarn install", realizing we forgot to run "run install" after syncing and we have to re-merge and re-upload, etc.

Here's a real-word example from last week: I spent several hours doing creative hackery trying to convince a particular compiler to compile the same file using different dependencies depending on context. That would have been a few minutes of work with bazel, but when your build process consists of "run this off the shelf compiler" and the compiler doesn't have any native support for building two different versions of the same thing with slightly different dependencies then you're in trouble.

Teaching new hires bazel is a one-time cost, and the only thing they'll need to get started on their first day is "bazel build <target>" and "bazel test <target>". When you don't have bazel, on your first day every new hire has to read through a gigantic wiki page explaining how to set up their dev environment (with different sections for mac and linux and special asides describing what to do if you're on a slightly outdated version of the OS, and then the wiki gets out of date and you have new engineers and the infra team all wasting their time debugging why the instructions suddenly stopped working for people on slightly newer machines, etc.)