Actually this is an option, rubber gloves that is provided they are suitable. Many people might be home users who just need to make a few adjustments to the yoke, the rubber gloves do add a degree of protection.

I find as you concentrate on the screen (even with a mirror) and fiddling with the yoke it becomes all too easy to make contact with some HT. To make it more risky, these computers are getting old and the insulation is deterorating so making an unexpected flashover more likely. HT leakage from the flyback transformer, tripler or even anode lead can happen anytime. I'm pleased to say that the anode cap is a really good fit and only comes away of not installed correctly in the first place. And as you all know a CRT will recover a charge when left with no anode cap connected. }

The rubber glove technique does get used in industry, I have seen "professional" gloves, really thick certified gloves guarenteed up to a specified voltage. Somewhat distracting I must admit and to use a pair in a develoment lab would be.. well, get attention.