The point is just not to impoverish yourself in order to save more than you need. You don't have to spend, spend, spend, but don't eat rice and beans every night just so you can have more money than you'd ever need in retirement.

This is one of those things where generalized advice often makes little sense because circumstances are so different. If you make $500,000/year, you can save half of your take-home pay and still live very well, and have a ton of money when you retire. If you make $50,000/year, you might struggle to save at all if you're supporting a family, and there's going to be a lot of tension between saving for retirement and occasionally having some nice things before retirement. Living in poverty to save for retirement and then dying before you can enjoy any of it would be a sad outcome here. But if you're more towards the upper end of this spectrum, those cautionary tales sound a lot like "spend spend spend."