Simple answer really. It's all about compression. Most developers don't compress games as they used to. So audio, videos, and texture sizes have increased dramatically.
This is the #1 reason and anyone can test it. Compress a huge game yourself with any packer you believe is the most efficient. Well? Of course it's much smaller.
Why is that so? Are compressors so expensive noone wants them? No.
The thing is, highly efficient compression takes time to decompress. Remember when a few members here said they'd rather download a game when unlocked than preload and decrypt preload data, because their download speed is faster than their i9? Yea, the same wait time would happen with decompression of the minimum sized package so there. Google for more about best compression tools.
Now you'll say well I don't care, I'll accept 10 mins of decompression even more if it means less data to transfer! Mhm, you will. Console users with outdated hardware won't as your 10 mins unpacking on silly i3 would be 10 hours on pathetic Jaguar. Am I exaggerating or the difference is that drastic? Well, try it yourself.
There is an additional reason. With an actual game you also receive all the data left from cut content. At one point of development, this content was decided not to happen in the game, but for whatever reason developers never remove now useless data.
Finally there is this 4K&FLAC craze. Luckily plenty of games offer separate textures pack for those who want 4K (the minority), sadly no such luck with audio format so far.
What's the solution? Currently, only buying 2Gb sized SSD and paying for the fastest connection in your area. See, publishers aren't interested in efficiency as it doesn't make money and better data management can't be used in advertising.
Again, currently. Maybe in the future professional game reviewers start panning unoptimized code and sizeable data. But I'm saying this since AC4, a singlecore destroyer. Nothing changed so far.
I wanted to try Shadow of war a couple of days ago, 110 GB and uninstalled it after 1h cause it was a borefest
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You suck.
It was a scam initially, but then Warner removed microtransactions and the game is now a slightly above average product. While I found it fun and finished it, can't say it's some mustbuy and mustplay game. Especially because it says Mordor, hintops on Tolkien but plays as a sort of Warcraft spinoff in ancient Assassins Creed world design.