My understanding is that the Python ecosystem is notoriously difficult to integrate w/ Bazel. Javascript is another ecosystem with a lot of fast and loose stuff going on during installs. Golang integration is way better. At work, we use wrappers over bazel (e.g. gazelle) mostly to handle things like auto-generation of BUILD files by parsing source code import declarations and the like. This takes most of the friction away, to the point that many folks don't actually need to understand Bazel to any significant degree.