SublimeText is not open-source. But there are probably other good editors on Ubuntu – Why not reusing them.
I, for example, develop on OSX or Linux using open source frameworks using jetbrain products like PhpStorm, Pycharm, Datagrip...
When you say "we keep investing effort" which group are you talking about and what effort? And characterizing the maintainers as a "vocal few" seems so entitled as to suggest a misunderstanding. Want Sublime to be the default editor for a Linux distro? You're probably going to have to start your own.
I personally don't care much for myself right now, since the OS X laptop + Linux on the server is still working great for me.