Treesmith, I am not immune to the logic of your argument.
What you might consider, however, is that OSHA regulates conditions under which employees are expected to perform their jobs by their employer.
As has been noted, if you don't have any employees, you are exempt. Do what you want, it's your choice. You are not placeing anyone else at risk, as would be the case if you operated a worksite with known hazards and required your workers to do their job there.
And of course, rock climbing is a recreational activity; it's a choice freely taken by those who wish to engage in it, including the risks. If you hire people to work on rock faces, as in manual scaling of highway cut faces to remove loose potential rockfall, you can bet that wiregate carabiners are not legal for your employees.
It's all about providing a safe work environment for those who must work under the conditions set by their employer.
Screwlock carabiners are banned for the very simple reason that failure of that locking mechanism has been directly attributable to specific fatalities, repeatedly. It's not an arbitrary rule made just to piss us off.