That seems like a contextual problem, not a Lua problem.

If you're in Love and/or control the environment you're free to bring in whatever libraries you want. Or to build your wrapper to support multiple files from the user.

Like you could suffer from a bad embedded scripting setup with any language. Granted if it was embedded Python or Javascript you would get a bit more for builtin if they embed a full implementation. But also embedding Lua with support for user supplied libraries is less effort than embedding a whole Python/JS runtime