To be scrupulously fair, the PGA Championship that Jack is talking about (1968) was not one of his wins. In fact, he missed the cut against that stellar field. It was won by Julius Boros, then 48 years old, and hardly ever mistaken for Brooks Koepka.
Boros had a long career, finishing 7th in the US Open as late as 1973, 21 years after his first of two wins in that event. But like most top US pros of that era, he didn't consider the British Open worth the time and expense to play. He played in majors over a 30-year span, but played the Open only once.
Another piece of data indicating that the majors of the 60's, with the possible exception of the US Open, were weaker than most of Tiger's regular tour wins.
There was some talk about these scooter gizmos at my home course. Sun Mtn was offering them up as a better way to play ready golf, and speed up play.
Last I heard the decision was still being made, but was not promising due to up front costs, and the extra liability the course owners would have to take on.
Personally I like the idea.