The saw manufacturers all blew off SawStop because they were worried that they would now be liable for any injuries which still occurred.
Simply make table saw manufacturers liable for any injury from the saw and this kind of mechanism will instantly become default.
That’s terrible though. You can’t make knife manufacturers responsible for everything a knife does.
Yes, they did. They even tried to legislate against SawStop. See "H.R. 8181: Preserving Woodworking Traditions and Blocking Government-Mandated Monopolies Act"[1] Didn't go anywhere.
There is supposedly woodworker opposition.[2] "Many woodworkers argue that the implementation of SawStop technology has disrupted traditional woodworking practices. Some feel that it has altered the craft in a negative way by making it less reliant on skill and attentiveness, instead placing an emphasis on technology to prevent accidents. This shift in focus is seen as a departure from the fundamental principles and values of woodworking." However, no actual woodworkers are quoted, and the author has a tool store, so this is probably astroturf PR. That web site is addressed to people with a semi-religious attitude towards woodworking, not to working carpenters or cabinetmakers.
(Having used circular wood saws, I am all in favor of blade-stop devices.)
[1] https://www.govtrack.us/congress/bills/118/hr8181/text
[2] https://www.woodworkcenter.com/why-do-woodworkers-hate-the-i...