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It replaces gvm/rbenv/pyenv/nvm/etc. with a single CLI. Saves you from having to use multiple shell completion scripts, bashrc entries and CLIs. Useful if you work with multiple dev languages on your computer.

And nowhere in the README tells me about that. Your first sentence immediately makes it clear

asdf maintainer here. We are in the process of re-organizing the README and all of the documentation. In it's present state the README isn't particularly clear about what asdf is and why it is useful. One of the maintainers already has a PR out to fix this - https://github.com/asdf-vm/asdf/pull/441

If you have any suggestions on what the readme should say feel free to open an issue or a small PR.

I'm sorry, I could have sworn the README used to have a snappy description.

Think of it like a Swiss Army knife of version managers that can handle all the languages you use, per-project. And it's all just bash scripts, and installs everything into a visible place on your drive.