That, and other resources tend to get compressed less as bandwidth and storage becomes cheaper overall. Less compression means less load on already underpowered console hardware and more importantly, less memory used, high end games tend to max out their IO and outright memory map things straight from the disk.

GTA V on last gen was notorious for reading off the optical disk and HDD simultaniously to spend less time moving things around in memory.

Disk failures are a major reason for performance degradation on consoles and why putting SSDs into consoles is a very good idea.

My first commercial game would fit in the icon of one of my current company's games . . .

Uncompressed audio is apparently a huge portion of the storage footprint of modern games.

Uncompressed, multi-language audio so publishers can ship one disc in all regions.

Microsoft supports per-region download slices, but I don't think many publishers take advantage of that because Sony and Nintendo don't support it.

Microsofts own Gears of War 4 is 133GB.