The past few decades of comics, especially DC comics, have shown how little they understand their own characters and their appeal.

DC have repeatedly had good stories they tried to adapt, or at least pretend not to in order to avoid paying royalties I guess.

Suicide Squad was Attack on Arkham, with a few minor character swaps, somehow Riddler isn't included but both Joker and Batman still are?

Man of Steel was Superman: Earth One just.

Both times someone decided to change things for whatever reason and they turned a good story into a shitshow.

Superman E1 is almost identical to MOS except the villain is some random rather than Zod who shows up in issue 3 of the comic so isn't rushed to his death then bastardised into Doomsday for shitty references.

Much like with Marvel there are several huge plot points in recent works that are so copy-and-paste not only could they replace significant parts of those movies with other characters but it would very likely have been better in the end. MOS could have used a completely different villain, whether the one from E1 or not. Suicide Squad not only uses the same general premise but also almost the exact same team. The only differences end up being the target, Bid Bad, and a few of the team which are even more interchangeable when you really look at things like Killer Croc instead of King Shark even though the latter of the two is in the second Suicide Squad movie anyway!

Avengers Endgame should have flat out used Nova instead of Carol Danvers for her entire participation in the final fight, and by extension film presence as a whole. Nova would have been on Xandar when Thanos attacked and stole the Power Stone. It would have been a possible vehicle to give him his powers in a similar way Danvers got her from a power surge from the Space Stone. More importantly it would have given Nova 2 things. First off it would have meant direct and personal time with Thanos attacking and wiping the floor with Nova and the rest of the Nova Corps, and second and more importantly an easy emotional weakness to fuck up the fight in Endgame and go full murder rampage instead of actually winning the fight and preventing even more shit going wrong. Because when you watch Endgame again that's what Danvers ends up doing. She shows up, takes out the big ship - which still has to land somewhere... - then after trying and failing to get the glove away goes 1 on 1 with Thanos and plays with him rather than just beating him. Were it Nova doing this because he was enraged at what Thanos had done it would be a far better excuse of fucking up and losing rather than whatever reason Danvers has of simply... not winning because she's shit?

It also would have meant to shitty retcon prequel that turned Fury losing an eye into a joke, yet another chance to kill "Coulson", Stan Lee's memorial screen being somewhere people might have actually seen it, as well as every other disaster that has followed because of the shitshow that is Carol Danvers.

But no, can't go giving the fans what they want, it's not like the popular comics are the reason superhero films work in the first place so why bother adapting the good stories in a way that works well? Better to just hire the same shitty directors to retell the same shitty adaptations like happened when Fox did the Dark Phoenix plot for X-Men twice and let Simon Kinberg write that again after already writing and fucking up X3: Land Stand WHICH WAS THE SAME FUCKING STORY!