Of course, if walkers were the problem, that walking foursome would have never gotten away from you.
Really, it doesn't matter if you ride or walk. It doesn't matter if you suck. You just can't take that much time looking for balls.
I suck and I walk. I'm able to do that without slowing anyone up. Especially not if we are behind four walkers to start with.
Nonsense or not if you did not experience what took place it is what it was. I would say in many circumstances walkers cannot keep pace with carts. In excessive heat for example a walker would fall behind due to exhaustion plain and simple. Again there is no single answer either way. We have only what we experience on the course that day.
My father was a tea planter and at work he started playing golf and tennis. By the time we were born, both my parents were serious golf and tennis players and we had a wooden golf club made by one of the carpenters before we were five. At around the age of 11 we were given professional lessons and have been playing ever since