Dial back all these streaming services and you'd have less content back then. And virtually no say in what to watch when, plus shitty ads. To watch anything specific, you'd have to go to the movies or go for a rental.
Now you have a huge amount of freedom of choice, with no ads, much more convenience, at fairly reasonable prices. The exceptions you mentioned are just that, exceptions. So that's my first point, we seem to be perpetually unhappy, no matter how rich an offering is.
Second, I consider this semi-fragmented landscape a solution, it's healthy. Services are fiercely competing with each other for your eye balls. That means they're in a race to produce good content and it suppresses prices. This is actually happening. When Netflix dominated, they had advanced plans for major price hikes. The arrival of Disney+ stopped this in its tracks. Do you really want this industry to be consolidated into 1-2 players? With a price monopoly? With producers being squeezed, creatively constrained? Just so you have to press one less button?
Third, the idea that you could combine the production value of hundreds of billions of $ worth of material into a single affordable streaming service for the masses is a delusion. The math simply doesn't add up.
Fourth, most people just vegetate after work for an hour or two. They need something watchable. They don't need 17 subscriptions, it's not a common need.