The gap is insane even between the FAANGs, someone got an offer at $450 total comp (inc grants over five years) at one and the other couldn't even break 225/yr total. Something is gonna have to give.
Why? The work product of a senior engineer (on average) is worth some multiple of the TC or the company wouldn't be paying it.
Tom Cruise makes way more than the director or the studio execs too. Because he sells tickets/rentals that make the movie more profitable. Same thing.