Shockstall
I've never used it and never met anyone under the age of 60 who has,
Allow me to introduce myself. I'm 57 and I refer you to my earlier post. I have used both, equally happily, according to various policies at various times and in various countries.
It really is overstating it to say
Not necessary with today's machinery, and in most cases very dangerous.
As I said before, it doesn't matter much provided you understand what you're doing.
Finally,
the old dogs who were taught it and can't bare to change
You sound a little set in your ways, yourself!