Your survey seems very flawed. It puts an average SRE at 175k yet the CxO's only make 200k. Are you sure you're not excluding stock based comp in those numbers?
In any case, even if you go by the data in your survey, a machine learning specialist is supposed to make 150k and a mobile developer 144k. Those are still a lot more than 70-80k.
> Yet in the real world, geography, and luck/ability to bootstrap to HCOL areas plays a huge part
Considering the bar to get into a FAANG is just 4-5 leetcode medium-hard questions, I think there is little gatekeeping happening. This isn't investment banking where if you don't go to an Ivy you can't get in. And there are a lot more firms than FAANG paying big salaries.
> I think you're underestimating how wide the gap is between the bimodal peaks
IBM is your quintessential example of a consulting bodyshop. If anything, they would be at the lower bimodal peak, not the higher one.