I make a typical SF software engineer salary and I live in a low cost of living area. The reality is that I still need about $3M to permanently stop working. Healthcare is expensive and the dollars that I'm making now will be worth much less later in life, even when prudently invested.
I'll probably be able to achieve independence by 40 or 45 instead of 55 or 65 because I have a low CoL and won't have kids. I'm very much looking forward to the freedom I'll have purchased for myself, but it's still an absurdly long time to wait to start living.
Until then, it's more pills and more work.
I have no idea how people manage to live fulfilling lives while still working 40+ hours a week, but I sure can't do it.