> The only advantage of uv is to have support for parallel async extraction

Maybe the only advantage in a particular area (installing)? Because there are many other advantages.

The rich lock file for instance allows for much better cross-platform tooling. I can build a linux Docker container from a macos build host, for example, without VMs or any other emulation - simply using the cross-platform details in uv.lock and the correct tooling. I can even cross-compile numpy and other native wheels (linux -> macos, macos -> linux).

Other locker tools provide similar cross-platform information (Poetry, PDM), but pip is still lacking.