Yeah, Hickman's run is a lumbering dinosaur ("AAH!"). Re-reading it in order to do some more-recent Hickman-era Avengers builds, I was struck by how much easier it was to read. But month-to-month it's just impossible to remember all of the tiny details. I'm sure New Avengers in particular is much more clear, as it's the "background to everything/Incursions" one, with all of the people talking in vague prophecies for the first 12 issues. And I HATE IT when characters talk like that, especially if it's over-done. I mean, I can barely remember what happens from issue-to-issue on that book, making me go "wuh?" when people with better memories predict things like the Super-Adaptoids turning into the new Mapmakers, because I forgot who the Mapmakers were and what they did.
But other high-concept stuff is amazing. The best book currently being written is Brian K. ("I'll make you love my characters, then I'll kill them mercilessly") Vaughn's Saga, which is INCREDIBLE. Some of the best dialogue and characterization in comics, which makes the "High Concept" easily-palatable. I wish I could build characters from it, but it's so good at only piecing together stuff that I'd have to add stuff each issue.