Ok, I see. A profile created in this way, with primaries and parametric curves, behaves like a "perfect" profile. That is, it can be inverted with no loss and its gamut is infinite. You can operate this profile with negative rgb or xyz values. Or with values well over 255. And the roundtrip is exact. So, if you tries to emulate which artifacts the profile causes, the answer is none and this is what you are getting in your softproofing. Built-in srgb behaves in same way.
Another thing is when you flush the profile to disk. Then you are forcing a quantized representation (in the case of v2) Also, doing that imposes a gamut because no negative numbers or highlights over L* 100 are allowed in the file format. Then softproofing shows you the limitations the file format has.
So you have to choose whatever the ideal representation and the file based.
Hope this makes sense to you
Regards
Marti
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