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The non-animated version is horrible though. I have a hard time seeing what's happening even when re-ordering just one item so when would speedrunning it ever be useful? I think it's a good example where the trade-off between feedback and speed makes sense.

Yeah if the use case is “user might need to click several times abruptly” time to NOT animate.

But there are places it works.

What kind of real world situation do you imagine mindlessly blasting an add button as quickly as possible? The animation seriously improves the users understanding of what is happening. Throwing that out to support millisecond speed button blasting is bad UX

Afaik it allows setting the animation duration, which should help a bit