It's not about seeing everything, it's about seeing what's good, and how that's scattered across a dozen or more services where it's buried under mostly mediocre/bad content.
Sure, sometimes there's an option to just rent/buy digitally, but often that ends up being way more expensive than just buying a physical blu-ray version.
Case in point: If I wanted to stream Battlestar Galactica (2004) in Germany then the first option for that would be Amazon Prime Video. Even tho I pay for a prime membership, buying all 4 seasons digitally in HD quality, would cost me 92€, there is no option to just rent them.
While ordering the blu-ray set for the whole show, on Amazon with delivery tomorrow, would cost me 48€, nearly half as much and I get a physical version I can use as often and wherever I want, even if the unthinkable happens and Amazon goes out of business.
Why does the clearly inferior version of a product cost that much more?