Re: If you were "stuck" on Solaris 10...
It's "illumos". No capitals. Some of the team get quite picky.
But yes, illumos continues the "just works without randomly breaking stuff on a regular basis" philosophy. Like Solaris, sits quietly in the background doing its job without requiring an army of squirrels constantly caring for it. Binary compatibility with Solaris 10 is excellent.
Used for new and very cutting edge stuff, like Oxide and Helios.
(Some of us are still running illumos on sparc. Now that is a bit niche, I'll admit.)