If you have a "top tier tech job" then I don't really understand the need for two years of savings. Do you think you won't find a job before two years? I guess it depends on location.
I've left jobs multiple times to take a few months off to work on stuff before job hunting again and I definitely didn't have more than one year of savings.
You are in a very small minority if you saved up that much in your first two years out of college.
Also, FANG comp packages have significant equity components and IMO it would be foolish to rely on that portion of comp for anything important; you can treat vested RSUs as windfalls to add to the retirement savings but should not rely on RSU grants to meet your goal of x% savings rate. New grads will have nothing vested for a few years so their ability to save is especially limited during that time.