It’s not like they’re looking for something easy either; after the herculean task of Infinity War and Endgame they still want to pursue wildly ambitious projects that could be years in the making.
You can’t blame the Russos for not wanting to do the Disney+ Marvel shows.
They found a type of storytelling that they like and they’re good at, and they want to do more of that.
And their success affords the freedom and opportunity to do so.