Yep. But sticking a disk in vs downloading 100GB at 700kb/s
Actually not to be that guy but sometimes installing from disc is actually slower, it is definitely the case for RDR2 for example. Another example was the new Spider-Man game, most people reported it as about 45 minute install from disc, my friend had it downloaded and installed in less than that.
On disc it is compressed, it removes compression first then install - however if you're on potato internet I can understand the difference, I use fibre myself which is the default in my area and find digital purchases quicker than going down the shop, getting it, coming back and installing, by a long shot.
Also pre-loading for new games is ace.