This is not what nix does unless a user configures it poorly. Nix will ship a single, dynamically linked package/version combo for all package that depends on it. Containers ship one for each package that depends on it.

Containers don't solve dependency hell. They just give you a standard way to ship your bespoke bash scripts.

If you like writing bash scripts then go for it. (Personally I'd rather be doing literally anything else, like, I don't know, shoveling manure.)