I disagree, though I see his point.

The obvious thing is to point to the Evil Dead "trilogy". They worked because they weren't made for everyone. Rocky Horror remains a culture icon for the same reason.

But, you know, superman. We have the example if the Christopher Reeve films of what can be done with the goal of staying friendly to kids and adults across wide age ranges you can absolutely make good movies that appeal to the widest possible audience.

But I disagree that's what needs to be done with DC's characters. Oh, there's some that do need it, and I actually think the newest Superman movie successfully did it. But you can't pull off that same vibe with Wonder Woman, and it would destroy a Batman movie that isn't a reboot of the Adam West version.

The thing about DC' characters is that there's layers. More so than Marvel, DC has a history of keeping their darker stuff apart from their lighter fare. You can't throw Red Hood into the super friends, you dig? Not literally, because that cartoon was a different universe, so Red Hood there was be much less gritty and grim™.

But you could throw him into either of the suicide squad movies. You could maybe make him work in Lanterns.

I think he likely means that he wants to just dump any of the less granny/kid friendly characters from the DCCU. Which is also a bad idea since the current generation of grannies is early genX and late boomers that are superhero accepting. To achieve what he's wanting would mean trying to convince a broader audience to sign up. Not impossible, but you'd water things down so much that established fans of the characters will nope out. Hell, the serious comic geeks already do nope out of a lot of the live action DC stuff.