That's 34 times larger than the Windows XP operating system!!
Can you say "unoptimised, lazy console port?"
You're comparing the size of a AAA game released today to a bare-bones (content wise) operating system released more than 10 years ago?
Then you compare the size of the game to how much compressed video you could store in that same space. FYI, 16 GB gives you something like 30 minutes of 1080p video if you want to do a semi-accurate comparison.
I'd suggest you just get used to the fact that your awesome PC is going to be obsolete after a few years. Or forget about playing modern PC games, console port or not.