That is a bunch of BS lol. In every single interview you can find of the development of the show, and I do mean every single one, they make it extraordinarily clear that this show is Timm's baby through and through and that is what he wanted to do since even before he did TAS. Even going back to the DC Fandome panel announcement they did Matt explicitly stated that his and JJ Abrams purpose on it was to support TImm's vision. The people at WBTV that greenlit the show explicitly stated that this was Timm's vision.
Matt Reeves: To be honest with you the most exciting part is I can't wait to see how it turns
out. I can't wait to see all of this come together. I'm a fan and I just want to see what Bruce does.
Executive Vice President of Alternative Programming for Warner Bros. Animation Peter Girardi has revealed Bruce Timm‘s approach to the upcoming Prime Video series Batman: Caped Crusader. What did Peter Girardi say about Bruce Timm & Batman: Caped Crusader? In an Annecy summary article by...
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Batman: Caped Crusader, launching on Prime Video, is a spiritual successor to Batman: The Animated Series and Bruce Timm talks all about it
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Evoking noir nostalgia and a blue-collar bravado that feels both modern and vintage, executive producer Bruce Timm and Warner Bros
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Every single show or movie is the result of a village, especially when there are writer's rooms involved as was the case with this, but it was Timm who came up with the show and the primary vision of what it is comes from him (tho in all fairness he did get nudged by Tucker into coming up with it at all, but like stated before there, even that was Tucker going "Yeah yeah but is there something else you want to do?" and Timm responding and them doing that). Even things like Brubaker's involvement you'd have to credit Timm since it was also Timm who hired Brubaker. He's the showrunner, he literally runs the show.
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Here, Timm, who is also serving as showrunner, and Tucker, the show’s coexecutive producer, take part in a Bat-chat about how this new chapter in Batman’s story came to fruition.
Why do you think that is?
Timm: He had an ulterior motive for it. He didn’t tell me at the time, but it was like, “I hear what you’re saying, but if you had a chance to go back, aren’t there things you wanted to do with the show that you couldn’t do back then, either because of broadcast standards and practices, or because the show evolved away from where you originally did it?” And the more we talked about it, it was like, “Yeah, there was a ton of stuff, actually.” My original idea was to make [BTAS] set more deliberately in the 1940s, not just a ‘40s-ish world like Tim Burton did. I’d really love to have seen it with rotary dial phones and no computers and all that stuff. So, the more we started talking about [doing a show more in the vein of BTAS], by the end of that conversation, I was all in on the idea. Then nothing really happened for a while. James was working on a couple of different projects, and I had some direct-to-video movies I was working on. It kind of sat on the backburner for a while.