The norm is to download several 30, 60 or even 120GB updates afterwards. You then end up with an inconvenient DRM disc that has to be inserted for your game to run. When instead you could buy it online, download it just like you would've ended up doing and then never have to worry about damaging a Blu-ray disc.
Don't get me wrong, I love physical copies of games... But in the era of never ending updates, live service games, indie games, and games broken at launch, I definitely understand why most of us don't prefer them anymore.
Hasn't Steam just beat its record of simultaneously online users? And while I'm sure Steam Decks contributed to this, we're taking of numbers an order of magnitude bigger. Hell, PC gaming is doing so well that we're seeing until then console exclusive games come out on Steam.