Bit late to respond, but as someone else pointed out, physical PC games are virtually nonexistent. Even the collector's edition of Baldur's Gate 3 I recently bought came as a steam key and a disk with the steam client installer and a few files for the game to make Steam think the game is installed and force an update. I was pretty disappointed by that.
And no, most people don't have a blu-ray drive or any kind of optical media reader in their PCs these days.
As for whether or not disks that large are printed on by publishers, most physical PS5 games are printed in disks of that capacity as are 4K blu-ray releases of movies.