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These days, I'd say it's probably best to use video for non-interactive animations. Flash is from a time where network speeds were too slow and video compression was too poor, both in ratio and picture quality, to be feasible. But now, it's a better option also because you don't need a runtime nor need worry about browser compatibility of some javascript animation library.

There's also https://lottiefiles.com/

> A Lottie is a JSON-based animation file format that allows you to ship animations on any platform as easily as shipping static assets. They are small files that work on any device and can scale up or down without pixelation. LottieFiles lets you create, edit, test, collaborate on and ship a Lottie in the easiest way possible.

Adobe didn't dump Flash animation, they just renamed it to Animate.