A major eye opener for me after the last couple of years has been how crazy our diets really tend to be and how easy it is to just stop it. Like, I used to battle internally about if I ate well enough that day to eat [insert garbage here]. Like that's ever a conversation worth having with yourself, or it would ever make sense to want the garbage in the first place. But I figured I was eating whole foods (usually, I guess, maybe?), eating meat from "good" and "ethical" sources, eating what I thought was a lot of vegetables.
And yet the science shows that people who eat like I did are dying earlier than they need to and suffering from diseases people didn't typically get up until recently. And I found myself gradually gaining weight despite not noticing a change in my caloric intake.
I'm not sure exactly what caused me to snap out of it (there were several factors), but in any case, I'm glad I did. And you're right – eating well is trivial if you're starting anywhere near the SAD. With a bit of motivation you can level up tremendously with minimal effort.
The great thing about the SAD (Standard American Diet) is that most any not-totally-insane restrictive diet will be significantly better. It hardly even matters which you choose, it will be better. When you start with terrible, even "bad" is an improvement!