Very interesting video even though I only did a little bit of electrical engineering. These videos where they don’t wear gloves or seemingly have no protection really stresses me out though.
The only protection you need is for it to be unplugged and if it has large caps you want to make sure those are discharged.
He’s sawing into plastic and electric components and has no cut resistant gloves or a vacuum to suck away dust. At one point he also had a soldering iron quite close to bear fingers. Parts where he’s just prying things off with pliers wouldn’t need maximum dexterity with both hands.
His argument is that safety equipment makes people complacent, especially when they are experienced enough to move quickly. If you have bare feet / legs, you are much more aware of the dangers and hence more careful. He still has all his limbs and the fingers / toes at the ends of them. Too many of his former coworkers do not. He is nearly deaf, so using hearing protection might have been better.
That's all anecdotal at best, but experts often disagree on the safest approach for themselves vs. others. And what's best for experts is often not what's best for novices, and vice versa.