I am with you 100% on the reddit aspect but have to acknowledge that any person can make their own choices. Eventually, a platform with much longer history will continue being successful, if only due to inertia alone. However, one more big mistake from reddit may be enough for the FOSS subs to migrate to this platform. As for the Linux kernel, are you sure it is hosted on github? Or is it only a backup?
And that’s how WW3 started…!
While all areas could benefit in terms of stability and ease of development from standadization, the whole system and each area would suffer in terms of creativity. There needs to be a balance. However, if I had to choose one thing, I’d say the package management. At the moment we have deb, rpm, pacman, flatpak, snap (the latter probably should not be considered as the server side is proprietary) and more from some niche distros. This makes is very difficult for small developers to offer their work to all/most users. Otherwise, I think it is a blessing having so many DEs, APIs, etc.
One thing that I love about Cosmic is that it is made in Rust and is licensed under GPL. This is contrast to the replacement of the coreutils with new, Rust made, which are unfortunately licensed under MIT. Ubuntu rushed to adopt them. One more case of foul play by them after making the server side of snap proprietary.