1) If you aren't at one of these companies, it's not a fair comparison. It's really difficult to find a pre-IPO company who is going to compensate you like these, if for no other reason than that options are just not something you can easily stick a dollar value on.
2) It's kind of depressing. It's very easy to find people at similar experience levels as you making FAR more money (perhaps 50%, or even double), because you aren't at a FAANG company (or whatever we're calling them now). It can really make you feel like you haven't learned/grown/accomplished anything in your career when you see people starting at a similar comp to what you get for a decade+ of experience.
Some people act as though these companies are an easy alternative for anyone, but the reality is that there are only a handful of them. For me, with a ruby background(+), I'm not particularly interesting to any of them, and I know I'm not the only one.
It's neat that between Facebook/Apple/Google you can compare apples to apples, but for a lot of people, it's really an apples to oranges comparison, and a frustrating one.
Also, I imagine it's that much worse for people outside the Bay Area.
(+: While I'm happy to learn new languages on the job and not tied to any stack, it's still not easy. For instance, a Google recruiter once told me to spend a few months becoming a Python expert, and then they'd interview me (in Python); another time a Microsoft recruiter insisted that I do the interview in Java and then got frustrated when I struggled with syntax I hadn't touched in 5 years.)