I think a sad fact of the matter is that a lot of those problems might still be aftershocks of Didio's administration style, the same issues that crept up before the New 52 and then during it.
Good books and continuity depend on good writing stables and consistency from editorial, even during the bets parts of the New 52, Didio and co. tended to arbitrarily decree something that contradicted even the brand new stuff or aggravated and ran off established and consistent writers as well as burgeoning new ones. And part of the annoyance of 5G is that Didio himself was known to loathe 90% of all legacy characters before then, but then wanted a massive deployment of mostly new ones for the blatant money grab of a special event and diversity, but without a commitment to it.
One of the things that handicapped the New 52's concerted effort towards diversity was Didio's blatant and biased view of it strictly from a shallow marketing perspective; you just had to wait long enough to see editorial screw up strong starts.
Batwing was treated as an interchangeable black hero between the two holders of the identity even though the two characters were radically different. They brought back a Blue Beetle book with Jaime and Static shock with a Milestone writer, but didn't manage the writing staff well and then exiled them into limbo when they "failed" them. They had a Batwoman book that was setting the world on fire, but then waltzed in and cancelled a wedding they'd already approved, driving off the creative team because they couldn't grasp the full context in which the book was successful. They let Scott Lobdell and Judd Winnick start off massively on the wrong foot with Starfire and Catwoman, then kept employing Lobdell after he became problematic, though not as problematic as a walking liability like Eddie Berganza. They tried rebooting Wally as a black teenager, only to go racist in their stereotyping. And of course, Didio's grudge against Cassandra Cain kept her off the field when there was no good reason to.