As far as Fedora is concerned becoming a package maintainer is a fairly straightforward process, and you are more than welcome to package up your own software and submit it to the software collection or solicit someone to assist you with it. The rpmdevtools package contains a super-useful utility called rpmdev-newspec that provides templates to create packages for most popular standards out there already (ruby gems, python setuptools/distutils scripts, CPAN modules, etc) - it's really easy to get started and you can always push your packages up to COPR without needing sponsorship from the existing packaging team.
Which is precisely why rpmdev-newspec has templates for this case. Simply running rpmdev-newspec -t ruby/python/perl/php-pear/ocaml/R mypackagename will generate a rpmspec file ready to go for any of these languages using their standard package managers (gem, distutils/setuptools, CPAN, pear, OPAM, packrat) - just add necessary metadata (Requires/BuildRequires, summary, description, version, and a changelog).
It's not magic, it still requires minimal effort (3 minutes worth of metadata + calling mock to test the build) - but it's hardly difficult. Sure, you could make some extra scripts to automatically populate the metadata from the language PM's descriptor of choice to limit the manual work to release bumps and editing the changelog - and I don't think anyone would be opposed to that, but that's pretty much all that would be left.
The biggest problem is outside of rolling-release distributions like Arch, Gentoo, OpenSUSE Tumbleweed and Fedora Rawhide bumps in major versions within a release are highly discouraged - and a lot of people used to using language PM's have a habit of changing things rapidly even post-1.0 and not supporting old branches - often leaving the distribution packager with needing to backport patches for security or bug fixes. I'm not going to argue if it's better or worse, but it's an issue that needs to be addressed.
I guess my issue is that "good enough" is a very fluid concept, and I often discover some months after that it was my excuse for shitty code/integration test.
> Copr is an easy-to-use automatic build system providing a package repository as its output.
> Start with making your own repository in these three steps: 1) choose an architecture and system you want to build for; 2) provide Copr with src.rpm packages available online; 3) let Copr do all the work and wait for your new repo.
Language PMs are "good enough" to solve the problems of the people actually writing the software, and in most cases that is really all that matters. I'm sorry they're not good enough for you, but it's not my fault that Rust, Python, and Go will let me upload to their package manager but Debian/Fedora/whatever you use will not.
Your fight is not with the language PMs, it is with your OS vendor who will neither give me upload rights nor send out someone else who does, who neither designs tools for me to use nor sends someone who already knows how to use them.
To be clear, I think there are good reasons why OS vendors won't change their ways, but software developers won't change our ways either, so neither language PMs nor OS PMs are going away any time soon.