I would argue that this was a horrible decision, even if everything turned out in the end. It reminds me of when a kid makes a really stupid decision that by c

I would argue that this was a horrible decision, even if everything turned out in the end. It reminds me of when a kid makes a really stupid decision that by chance turns out well, and the parents (correctly) yell at him despite the result. If it had turned out that there was a minor flaw/"bug" in his implementation, he'd lose his finger for no reason. What would be much better is to make lots of test saws with his technology and give them to carpenters for free. The worst thing that could happen is that someone who would have lost their finger anyway would lose their finger. The best would be free publicity.