I also wonder if 3d animation changes anything about this approach. I enjoy watching Japanese anime but 3d productions can be hard to watch with an English dub because it's very apparent that mouth movements don't match, whereas with more traditional 2d-style animation the mouth flaps match more easily in the mind. Video games made by Japanese studios for Japanese audiences can be particularly hard to watch with an English dub.
There is a middle ground, seen in 2D western animation made on a lower budget than your typical Disney fare. Artists will create a mouth chart which includes drawings for a wide range of English phonemes. They are then used as a guide for drawing. There are software tools that assist in this process, making it a lot easier to do in a short amount of time. This is probably how South Park manages to do real accurate lip syncing while working on a 6 day production cycle.
At least at the time, the situation you find so weird was common enough to be satirized, based on dubs of live-action movies.
https://www.gamespot.com/articles/why-batman-ninja-in-englis...
>"My first exposure to the anime process was working with [Hayao] Miyazaki on Spirited Away," Chu said. "It was just very interesting watching him do the story. Like, he kind of thinks up the story, and then you don't really write it, you start sort of thumb-nailing out like, what key visual moments might be, and then you start storyboarding and then you start animating.
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>"And I was like, 'OK, but what are you animated to?' He's like, 'Oh, we just make the mouths move.' And then I was like, 'But is there dialogue?" And he's like, 'No, no. We add the dialogue at the end.' And you're like, 'Oh, that's really weird.' And people always complain about, 'Oh, I'm going to watch the original Japanese version with English sub, not the English dub version,' but the truth is the Japanese version is dubbed as well."
At least personally, the voice acting seems just so different. My preference is not related to the differences there may be between dubbed or not.