What about nix?
Or if it's just for developer tools, the 100 tool managers that exist, like asdf and rtx.
Sometimes a package manager doesn't have my package doesnt get solved by adding one more package manager.
Sometimes a package manager doesn't have my package doesnt get solved by adding one more package manager.
[0] Don't take this criticism too harshly; I'm writing this comment on a nixos laptop;)
To address your concerns: 1. Hysp is not a developer tool and isn't meant to be used as such.
2. Nix, Conda etc. all can & do work without requiring elevated privileges or root. However, what differentiates hysp, is that it is simply a downloader for a binary hosted somewhere else (defined in config file), that it fetches, verifies sha256sum/blake3 sum & puts in the directory (also defined in config file) which can be then directly called & used.
3. Hysp, doesn't care about dependencies, and neither does it attempt to install anything that's not specifically defined in the config.
4. As installing random binaries from random sources is not advisable due to security concerns, the pkg-source can be self-hosted by anyone and hysp can be configured to use that instead of the default source.
And no nix is not "it". Don't get me wrong I use nix as much as possible but it's frustratingly close to "it" but it isn't "it".