The central problem with streaming as it's constructed is that each of the providers is trying to replace cable in its entirety, rather than a particular channel. The one possible exception being Disney+, which has a distinct skew towards family-friendly content (though that's becoming less true than in the past). So if you're say pretty exclusively a fan of SF/fantasy content, you still need to have subscriptions to every service (or at least start/stop them periodically) because 2-4 things you're interested in will be exclusive to a given service in a given year. But you end up paying for access to a lot of shit that isn't relevant to your own interests (for example, you have to pay for access to extensive libraries of children's content, even if you have no kids and zero interest in said programming).
From an end-user perspective, the ideal situation would be if each of the streamers was specialized. So you had a service specializing in sitcoms, another on dramas, another on SF/fantasy, another on kids shows, etc. But this wouldn't be ideal from a studio perspective because it would result in savings for consumers. Or, I should say many consumers, as sci-fi/fantasy is bigger budget, and probably subsided by cheaper content like reality TV and standup comedy. Much like how in the days when people still watched cable, non-sports watchers subsidized those who watched sports, due to the huge costs associated with ESPN licensing.