Everything about Saw Stop is either proprietary, exclusive or expensive or all three ...... for those of you not familiar with them, like me.
You are partially right, allow me to clarify:
Expensive - Yes, and SawStop charges top dollar because they own the patents. I view the cost difference as the "price of an insurance policy" to reduce the risk of a serious table saw injury. You get a top quality table saw, too. As I have stated many times before, I wish that they had found a way to license the patents to all table saw manufacturers so everyone could benefit. The patents belong to them, and it is not illegal to be a jerk about it.
Proprietary - For SawStop brakes, attachments, and accessories, but not much else. SawStop brand accessories are expensive, but I . Hopefully you will never need to buy them more than once. Most other table saw accessories just work on SawStop table saws the same as other table saws. Third party table saw accessories like sleds, guides, and jigs, all work fine. Proprietary accessories are not exclusive to SawStop. Many brands offer proprietary accessories of their own.
Exclusive - True if you are talking about their safety patents in the USA, which they have used to block competitors with safety saws. I know, because I used to own a Bosch REAXX.
Otherwise, SawStop is not really that exclusive:
* You can use nearly any 10 inch table saw blade.
* You can use any 8 inch table saw dado set with "winged" chippers.
* You can use nearly any ordinary table saw accessory: sleds, featherboards, guides, jigs, etc. There are a few exceptions, and you must take care to prevent metal on the gadget from triggering the safety mechanism.
* You can cut anything an ordinary table saw can cut. You may have to bypass the safety circuit for certain materials - wood with metal foil, pressure-treated lumber, very wet wood, etc. I cut dry wood 99.99% of the time, where it is not an issue.
The following are not recommended with SawStop:
* Blades with anti-kickback tails behind the carbide tips. You can use them, but the tails slow down the operation of the blade brake mechanism. Freud changed over from their SD208 dado set to their SD208S dado set for that reason. As noted above, some of their blade designs still have tails. I was disappointed that they removed the anti-kickback tails from the SD208 (now SD208S) dado set until I got a SawStop. :-)
* Dado sets with full blade body chippers. Chippers with wings are approved. Dados sets with full blade body chippers are too massive for the SawStop brake mechanism.
* Dado sets wider than 13/16 inch. I have seen that limit on other table saws.
* 6 inch dado sets and other dado sets that are smaller than 8 inches. The SawStop saw will refuse to run.
* Blades with non-conductive materials - lacquered carbide tips, plastic hubs (wobble dados?), etc. You can run lacquer-coated blades through a few boards in bypass mode to abrade the coating off the carbide tips. After that, the blades are okay to use in normal safety mode.
* Those Rockler miter fold dado sets. I wanted one after I saw the demonstration, but never owned a table saw that could run it. https://www.rockler.com/rockler-mite...-dado-set-plus
It should be noted that other table saw brands have their own limits and proprietary attachments. SawStop is not alone in that regard. Some older tools were so popular that third-party companies made accessories that matched proprietary fittings. I see that a lot with my 1953 Delta bandsaw, but not as much with SawStop. I am reasonably pleased with the reusable insert plate from Infinity Tools, which means that I do not have to buy expensive zero clearance inserts from SawStop:
Hopefully we'll see more third-party accessories for SawStop table saws. That may not be entirely a good thing. Thinking of the future, I can easily imagine a $5 SawStop brake in an unlabeled, unmarked package from an unknown source on eBay, after the SawStop patents expire. Would you buy it?