According to a friend who had the displeasure of looking at the file size, he claims it's 170GB when all is said and done... Stupid Sony square refusing to let steam preload...
170 GB is insane. Publishers should really get punished for making larger than average deliveries. Most of that size usage usually comes from poor optimization.
They're typically optimizing for fidelity and performance ahead of install size. Multiple LODs can balloon an install size quite quickly, but they'll give you better bang for your buck in other areas, and storage space is a concern that dissipates more in time, as you upgrade to newer machines.
I have seen this theory floated a few times. The problem is that reading uncompressed files from disk can often be slower than reading less data and decompressing it on the fly efficiently. Would be interesting to see actual studies of this for common game data.
It was faster to load the higher resolution data back in the early 2010s on HDDs, so I don't imagine it got any better for using compression now that we're on SSDs.