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I mean, why not laser cut a mylar sheet? That's an existing method and works well for 0603 footprints and similar, and is also quicker.

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Yes, that's the usual approach. Mylar sheets for short runs, stainless steel sheets for production. 3D printing in PLA probably won't have enough dimensional accuracy for fine pitch boards or boards of any size. The demo shown is a very small coarse pitch board.

The thickness of the stencil matters, because that determines how much solder paste you are laying down. This approach is going to produce thick stencils.

There are CNC machines for laying down solder paste. Here's one.[1] It does a few more jobs, too. The various CNC desktop board-making machines are still too expensive for most hobbyists, though.

[1] https://www.voltera.io/products/v-one

You could solve the inaccuracy by just using a resin printer, that should have enough accuracy (maybe with some fiddling with the settings/trying out resins, light can bleed to the sides of the tiny holes needed). Although I have never done a stencil that was very fine but did fine silicone moulds with them.

There are quite a few people who own a 3D printer but not a laser cutter. And not everyone can or wants to use an external service.

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