I get your point, but, not to ruin the joke, the benefit of owning a physical copy means you're in control. Buying a digital copy online means whoever sold it to you still owns it and controls it - you just have access to whatever they allow. So it's possible that your entire rights to watch that digital copy could be eliminated at some point. We've seen digital services shuttered already. People often lost purchases because the service that provided them no longer exists.
Also, the provider of digital purchases controls the quality of what you see. You still need to stream it, so they can compress the data however they want. For example, we tend to assume higher resolution means higher quality, but that doesn't account for bitrates, compression artifacts, reduced color range and lower audio fidelity. Something that's streamed at 4K resolution can look and sound worse than an 1080p blu-ray. Ripping your own discs means you control the compression.
Ripping discs also means you can watch them digitally which can save the original discs from the wear and tear of use. And you control how much you can copy them, and what devices you can play them on.