It’s very interesting, the same flatness / not hitting white was already the subject of this old ‘filmic’ (not darktable’s implementation, but related) blog entry – just look for ‘overshoot’ under Deriving the Shoulder.
I think it also demonstrates what Aurelien got wrong with those weird brightness inversions on saturated areas. That’s under Luminance Only. (But it may be best to split this off to Processing, maybe, since this second part is not relevant to the original question.) So, if someone wants to continue the general tone mapping discussion, maybe we can do that here: Tone mapping and gamut compression articles
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