Information on changes for updates come quickly, and it's pretty standard practice to clone your boot drive before major updates.
In a worst-case scenario, you just stay on a version of macOS until it makes more sense to use that same hardware for a Windows/whatever OS change.
Also, at this point, the things that would brick you in the past are no longer applicable with a modern hackintosh.
That may be fine for a home user, but if my livelyhood was dependent on this machine I'd rather buy something less hacked together and with actual support options.
This is not about wether or not it will actually work, it's about liability.
If this machine bites the dust, I swap out the part or I restore from Time Machine. At least with this machine, I have the option of swapping out the part.
It's not some mystical black box. These are standard PC parts that are supported by macOS. I think I only use two kexts that aren't shipped with macOS to get to 100%.
My 10.13 computer is my main one and was on 10.11 before when I upgraded only because I did a clean install right before the newest release. Don't remember noticing any changes.
I'm a huge Apple user but don't keep up with OS changes since they are so minor. This really isn't an issue. And if it's for business then the apps that are trendy and only for newer versions won't matter either.
Can you guarantee that ? Who is responsible if an upgrade doesn't work or bricks your machine ?