With comics specifically, marvel and DC have been out of touch for a very long time. The best stories tend to be one-shots or short stories that don’t interfere with the ongoing arcs. There’s also little perceived variety given those two powerhouses, despite them not being the only USA comic publishers.

Compared to the US, Japanese manga has much more variety in styles and stories, though some genres (flashy fighting, harem shit, Isekai shit) are beyond oversaturated. A manga that becomes a success has a high chance of becoming anime too, the same doesn’t seem to be the case with western animation, which tends to work the other way around more often (a cartoon gets a comic release).

Lastly, USA lacks a single fucking mecha cartoon. Megas XLR was ages ago.

Side note: I cannot, for the life of me, understand why the fuck Netflix went with a live action rendition of Sandman, instead of an animation, which would be perfect for any and every sudden change of style instead of relying on cgi that stands out against the actors