Here's an example of a golfer who doesn't benefit from the design of the modern day driver.
Most modern day drivers are 45.0" to 46.5" long. I use a driver that is 45" long, but I am 6'3" tall
The problem with clubs too long is that in this case, they do not allow for the golfer to bend their waist enough.
So why is that an issue?
So when you get too little waist bend, the shoulders will likely turn on too flat of a plane, which then will likely cause an over the top move.