This sounds like really bad advice. 401K limits are 22.5K this year. If you are making 100K and you are able to put away over 20% of it, maybe that gives you a reasonable probability of maintaining your lifestyle in retirement. If you're making good money and you're only saving 22.5K, you are probably going to take a serious hit whenever your income stops.
You are also completely undervaluing having "dry powder." Let's say interest rates go through the roof and "nobody" can afford to take out a mortgage, being the one guy with cash-on-hand will let you capture some once-in-a-lifetime real estate deals.
Also, freedom. Under your scenario, someone working a decade will have saved 220K in their 401k and that's it. Now they want to quit their job and start a business. They have to cash out their 401k just to sustain ~1 year of them not drawing a salary. Who's gonna do that? Versus, imagine the same person has a ton of additional savings - they can take the risk because it's a much smaller risk to them (longer runway)
// if there is money left over after paying for normal life enjoy it as you can't take it with you
You are probably undervaluing the "enjoyment" people get out of deep financial safety.