Curious; apart from not needing any of the new features in Sierra+, and not wanting to risk bricking your primary work machine, what’s preventing you from upgrading?

I have work to do at $dayjob and for that purpose the laptop works just fine. I don't want to risk any upgrade, especially after I heard that some tools and applications I use don't work well under High Sierra.

I guess the counter question is, why upgrade? I'm usually a version or two behind on Mac and iOS. The features added are usually minor. Never seems to be a reason to upgrade quickly.