don't understand why people need to keep the install data after they completed the games...

or should i say i'm really admire people who can play 10 games at the same time which i can't...

I thought these huge installs were just for th downloaded versions, if they are needed for the disc versions too then I'm not getting a next gen console they they significantly increase that HDD.

Yet another "gift" from the PC gaming world. Oh well, I was planning on a 1-2TB HDD anyway.

37 gigs is the full game if you wanna install it that's all

I believe this is for the retail game.  Blu-rays do not move data that quickly so both the Xbox One and PS4 require a HD instilation of the game.  Completly in case of the Microsoft on, and a partial cache for the Sony one - and this cashe is 37GB!  That's why it is so shocking.