I try to respect a self-imposed policy of not installing proprietary software that's not properly sandboxed, as I have little control over it (think about the Remote Code Execution hive that Steam games must be).

I do not use Sublime Text personally, but if I ever want to try it, I'd do it trough a flatpak. Yes, sandboxing permissions might not be perfect yet, but a little sandboxing is always better than none...

Have a look into flatpak too, otherwise in the not-so-distant future the users could have a problem.

For Fedora, they are planning switching to Silverblue around Fedora 30 (atomic system, rpms still supported, but jumping around the hoops).

It will be interesting to see if Flatpak, Snap or AppImage ends up being the predominant force in the new wave of Linux packaging. Knowing Linux, users will probably expect projects to support all three. :-)