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> or you are saying if there is some intermediate transform that makes color go beyond P3 it will get clipped?

Exactly! The conversion between ACES (or any working color space) and the display color space benefits from manual tweaking to preserve artistic intent.

Can you link to a Blender issue?

Display P3 (distinct from cinema display P3, because names are hard ig) is used as a render target color space. ACES (and its internal color spaces) are designed as working spaces.

If you make a color space for a display, the intent is that you can (eventually) get a display which can display all those colors. However, given the shape of the human color gamut, you can't choose three color primaries which form a triangle which precisely contain the human color gamut. With a display color space, you want to pick primaries which live inside the gamut; else you'd be wasting your display on colors that people can't see. For a working space, you want to pick primaries which contain the entire human color gamut, including some colors people can't see (since it can be helpful when rendering to avoid clipping).

Beyond that, ACES isn't just one color space; it's several. ACEScg, for example, uses a linear transfer function, and is useful for rendering applications. A colorist would likely transform ACEScg colors into ACEScc (or something of that ilk) so that the response curves of their coloring tools are closer to what they're used it (i.e. they have a logarithmic response similar to old-fashioned analogue telecine machines).

IDK how they compare to professional CAD tools, but I've heard good things about FreeCAD and OpenSCAD. I know that some people use Blender for CAD work, and there are even some extensions to make it easier, but I'm dubious that the representation of meshes that Blender uses are well-suited for CAD applications.

It might be possible to reproduce the same effect in EEVEE using geometry nodes. I know people have done that for automatic level of detail work. That being said, IDK if subsurf as a geometry node will take a non-constant number of iterations.

Is this the first blender release where you can change the working color space? I thought that you could in previous versions but it caused issues with some nodes.

Now I want to look into it more, but I'd imagine that "Blackbody" and sky generation nodes might still assume a linear sRGB working space.

I've been using blender since at least 2010; it's so exciting to see how much progress it's making.

I'm very excited to see the addition of structs and closures/higher-order functions to blender nodes! (I've also glanced at the shader compiler they're using to lower it to GLSL; neat stuff!) Not only is this practically going to be helpful, the PL researcher in me is tickled by seeing these features get added to a graphical programming language.

If you haven't heard of Blender before, or if you think AI will replace all the work done in it, fair enough. But I'd still strongly suggest looking into what it is and how it works.