Another part of the perceived slowness of the release schedule is the glaring omission of sourcebooks, which used to be the mainstay of the releases back in 3e. You have setting overviews, you have adventures, you have rules expansions, and you have monster books. But the closest we've gotten to geographically themed sourcebooks since the Sword Coast's Adventuring Guide are Storm King's Thunder and Waterdeep: Dragon Heist, both of which are primarily adventures with a small geographical description attached. There's nothing like 3e's Sharn: City of Towers or Faiths of Eberron (or for FR folks, City of Splendors: Waterdeep or Faiths & Pantheons). And while some of that stuff can be found on the DM's Guild, it's not integrated into D&D Beyond.