Because that’s what Blender uses, and those are the primaries the rotation and attenuation settings were developed for. Plus, a wider space may help controlling those saturated colours (you can find that mentioned in previous posts).
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The user’s preset will have the priority. So no problem on this.
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Hello,
Just a quick thought,
It would be interesting to have presets for the primaries, so we can keep the curve settings.
Greetings from Luberon,
Christian
Wouldn’t that need something like a “partial preset”, which modifies only some of the parameters for a module? I’m not sure that’s technically possible in the current implementation of presets.
Not that it wouldn’t be useful in other places, but that’s a different story.
What kind of presets for primaries? Partial ones, as rvietor said? Would that be an on/off? Because for that, a simple checkbox toggle has already been suggested. That would be simpler than maintaining several presets.
Or do you want different rotation etc settings? Without partial presets, that won’t work. And who would author the primaries settings?
PRESERVE HUE
I nearly always prefer the results with this set to 1 and would prefer that as default. Anyone else?
To me it doesn’t really matter, not much of a difference for most of my images. But for sunsets or for example the gas fired flames I showed in a previous post (glass factory), I start from zero and then increase to taste to avoid too pinkish colors, to keep it more yellowish.
Anyway whatever presets/defaults for primaries, preserve hue or dynamic range scaling, they can quickly be changed and they are of secondary importance to me. Most important is that you can easily achieve smooth transitions and adjust contrast and saturation with agx.
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my opinion would be:
a separate on/off switch and a separate preset menu for the primaries.
that would be the ultimate dream for me. 
otherwise i think the module is perfect as it is.
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Would it make sense to rename the module to something other than agx? At this point it seems like AgX is something the module can do, but it is not the singular thing that the module does. The tone curve seems to be the thing that is of most interest to people.
Kofa’s Official Faux-AgX Tone Mapper 
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Absolutely no. The primary (no pun intended…) purpose is approximating the original AgX, that people can tweak if they want, not the other way around.
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I think you should consider the module name KOFAT though.
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I am fat, yes… But why imprint it in darktable? 
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My 2 cents but for me the Blender like primaries should be the default. People loved the module’s output before they even had access to the primaries and there was nothing but praise for the output
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It’s crying out to be called KOFAgX, surely?
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Knock-Off, Flawed AgX or Kofa’s Obviously Fake AgX?
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Kofas own fabulous AgX
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At least I got everyone talking about what really matters: recursive acronyms!
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Not yet at the HURD level, though.
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Ah, you mean the AGX module will be talked about for the next 25 years, but will never actually be implemented…
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I will raise the PR later this month. I don’t expect any other new UI features after adding the checkbox to disable the primaries for people who want that, even if only to do a quick A/B comparison. But it was never intended for the June release, anyway.
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To be fair: HURD is being developed since 35 years. It actually exists. It’s even kind of usable. Hardware support is seriously lacking, though.
It’s hard to imagine a more sorry state of things.
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