The confusion is that OSHA and ANSI go hand in hand, and most of the OSHA regs are based on ANSI.
That is correct. Consensus standards, including those created by ANSI, help OSHA in determining the actual "laws" by which companies are governed; OSHA may choose to adopt ANSI standards verbatim. With that being said, OSHA has no jurisdiction over the use of consumer goods, rather they are here to protect the workers, in this case, the lawn care worker. The Consumer Product Safety Commission handles matters (cases) related to consumer safety. Yes, in order to avoid liability, companies will include safety devices on consumer goods, many of which can still be operated safety without those safety devices, yet are necessary to achieve a higher level of safety (which requires then less diligence on behalf of the consumer). Working in Occupational Safety for a living, my biggest issue that I have is taking the responsibility away from the individual doing the work. This isn't to say that we are better off without safety devices, it's just that people should be safety minded as well. I surely meant no offense, but I see the world in the eyes of someone who has been personally affected by someone injured on the job, I work in the industry, and I do as many things as I can in life thinking safety first. Nobody every deserves to be injured, that's for sure!