I had the same sentiment, but uv seems to have eliminated the competition. Installing uv using your OS package manager is enough as it can also download and install (isolated) Python interpreters as well.
Who are "they"? I am not waiting for anyone to adopt uv. I've adopted it myself and forgotten about pip as uv is pip-compatible for all practical purposes.
Compare to npm which has been the default installer/manager in NodeJS since forever, so it's totally supported, and any git repo you happen to download has a package.json