I saw a similar Saw on this old house. They used a hot dog to demonstrate how it works. what they didn't tell you is that the piston that stops the blade is only good for one shot.
Id rather just keep my hands out of the way.
Nobody intentionally puts their fingers into a spinning sawblade.
Putting your fingers through a spinning sawblade is also a one shot deal.
There is no amount of money in the world that could replace the use of my fingers.
Your post is almost as annoying as some of my replies on this site.
I use a power saw when doing installations. We use wood to make racks and supports, also to support ducts. I cut 2 fingers when I was in high school with a table saw. Only took 8 stitches and 2 months to recover. I still bear the scar. That IS an HVAC tool, depending on just what you do. We had a table saw like that in our shop for years. It was retired after about 40 years. I can see you don't have all that much field experience.