Part of what made Batman: The Animated Series so special was how it took advantage of the medium to do things Batman's live-action offerings couldn't. Between the striking Gothic art style, ambiguous time period, and supernatural elements, the beloved series had a clear advantage when it came to telling stories even Batman's best films simply couldn't. The very nature of live-action filmmaking, particularly within the framework of massive franchises like Batman, comes with certain limitations the classic 90s series simply didn't have.
https://screenrant.com/batman-animated-series-moments-movies-cant-copy/