But if you have the physical disk, you can still play the game. If the digital license gets revoked, you can no longer play the digital copy.
The flip side of that is you still have the digital version installed. Many games have been removed from PC/Console marketplaces that are still playable.
If you break your disc though you don't magically get a new copy.
Both formats have their pros & cons.
As for buying digital though I was more aiming at customs can't confiscate a digital item!