Earlier quoted context omitted.
Software development pays incredibly well by the standards of the average American. You can spend that money on lifestyle inflation, or you can save/invest it and buy yourself an enormous amount of financial freedom. Whether you call that "being independently wealthy" is a matter of semantics.
Yeah there is a lot of space between "has savings for 8-12 months" and "is independently wealthy, i.e. can live off interest of their own savings". Former is extremely easy to achieve if you can save significant portions of your salary. If you can save 30%, you can achieve it after 3 years. Latter takes a bit longer.
I think there is a mentality difference here. I have savings that would easily last me 10 years of not working. But... that's kind of my plan. I will be retiring some day.
I don't want to use up even a dime of that money by not working in my prime earning years.