Shenmue III might be larger when installed than when on the Blu-ray (e.g. if the game is compressed and requires installation to play).
It will be in interesting to find it why the game requires 100GB. Is it just the developers being safe because they’re not sure how much content the final game will contain? I know that previous Shenmue games had a lot of dialogue, but I can’t imagine additional voice recordings would take up that much room, even if the installer contains both Japanese and English recordings. Perhaps some of the cut scenes are recorded separately and then saved (rather than produced with the game engine), like the old FMV movies of the Saturn era?
There’s certainly some additional effort in keeping everything running smoothly with PC games, both time and money. The benefit I see of the PC is it’s large back catalog, which even with Microsoft’s emulation efforts this generation, that catalog is unsurpassed. The conservatism of Windows is both it’s strength and what holds it back. For newer games, there’s not much advantage of buying on PC over console gaming, especially as Microsoft and Sony have changed the game with mid-generation console upgrades. I suspect that in the future the accounts that we use will become more important than the hardware anyway, as purchased games become more fluidly available on multiple platforms.