I don't want to make digital seem better, but for this argument it is... you don't even need the disc, you just turn on the console and select the game. All from the comfort of your sofa. Hell, you don't even need to go to a store or wait for a delivery in the first place, all those bytes just come to you.
I think something to realize here is that A.) The above is why the majority of people just use digital at this point, and B.) Inserting a brand new game disc into your console still requires downloads, installing and often being online to do so anyway. Modern games rarely even fit on one disc, so the disc is less useful that it was in the XBox OG and PS1 days. It's more like what Nintendo is doing with the Game Key Carts.