Of course, the author of Die With Zero has a point to prove. In some ways, it's two sides of the same coin. But more than saving, the reason for many people having a lot is their investment performance. If your wealth doesn't go to zero, it's quite likely to go parabolic. Look at the full results of a Monte Carlo simulation, and look beyond the "failure" numbers into average or maximum values. Those kind of results happen, too.
I think he addresses this better just below the phrase you highlighted:
"What prompts people to save more than they can spend in their lifetimes? I believe it’s that they try to cover every worst-case scenario, which is what insurance is for. Unless you’re a billionaire, you won’t have enough to cover every worst-case scenario on your own anyway, so trying to save more for that is a losing game. Sure, insurance won’t cover everything, either, just like a seatbelt won’t always save your life in a car crash — but it’s still better to drive with a seatbelt than to never get in a car."
The worst-case scenario is what the 4 percent rule is all about. Look at Bengen's original research, and see the range of potential withdrawal rates. The only problem is, you don't know what level your particular year gets until after it's all done. But retire in the early 80's, and you could have had an 8% withdrawal rate. That is some level of variability! A prudent planner at the time, having just existed the stagflation of the 70's, was probably rollin' in it!
I think it's fine to focus on achievement rather than risk avoidance. Whatever floats your boat. But attributing that primarily to factors in your control, without acknowledging the role of external factors, is selling snake oil to someone, and will end up with a lot of disappointed people who will only know it when it's too late to do anything about.
I do agree that retirement planning needs to be about more than just money. Whatever lifestyle you have or plan to have, it can be very hollow and disappointing if you don't take some action to steer it in some direction.