Lol. Marvel Studios isn't a draw by default anymore. With the Infinity Saga over - there's no umbrella threat and MacGuffins to tie every movie into each other.
Nobody is going to care about the MCU other than "hardcore fans", now, so your comment regarding "other superhero universes" is moot. The MCU is not its own genre. You're so biased that you're just making s^&* up, now. Get a grip on reality. Marvel has no more "content to mine from" than any other studio with published works. Another moot point, though, considering that they make half of their stuff up anyways. More Marvel bias. They haven't "captured the world's imagination" because most of their movies are predictable. That's what made Thanos, Infinity War, and Endgame unique. They didn't draw from the blueprint. Even as good as The Winter Solider was - it was the same carp as the rest of the MCU.
Not sure how you don't get 4 out of 2 + 2. Disney+ = more time and money. That's called stacking fatigue. Common sense, dude.