Assuming you "own" a digital copy Playstation and Xbox will be just as secure. Well, aside from issues with forward compatibility a few generations down the line which is always less of an issue on PC.

The issue with discs is that they're expensive (shops need to keep them stocked, they need to be distributed to the shops, etc.), slow and fairly low capacity so most modern games would require multiple discs. The last one would, in addition to being annoying, severely limit game design if the game needs to be playable without copying all files over to the console's SSD for some reason.

With all that said - I can understand why people would want to be able to install from discs. Yes, discs are slow but some people's internet is even slower, especially in rural areas.