You're talking about someone who spent decades in a government provided/union protected job. It shouldn't be at all surprising. No intelligence required.
Hey, A*****e! F*** you down! You don't know s***!
Let's get back to Jhnnn's statement. It is very likely, given the average brain capacity of the average citizen, they THINK it is a way of saving money.
But the proper strategy is to assure that Withholding + Estimated Tax Payments = Tax owed at year's end. The target should be zero (0). It is inconvenient to adjust the W1 frequently, so people are not likely to do it. A combination of withholding and estimated tax payments makes it possible.
People who make estimated tax payments are likely to be sole-proprietor business owners, people with variable income or income that is more transitory (such as a car salesman on commission with only part or no fixed salary). I was doing it because I was a civil service careerist by day, and a consultant at night, then an adjunct college professor by night. It then continued as a practice because I have a rental property, which is sometimes vacant, or sometimes requires deductible repairs. So I can adjust my estimated payments during the year according to the ongoing income during the year.
But zero should be the target, whether you have a stable and reliable salary, or a variable income.