Interesting question. Me, I’m a fan of linear TRC camera profiles, with any conscious departure from the camera space to be done in a deliberate operation.
That said, I’ve come to rely on the LUT dcamprof creates from my SSF data to tame the conversion of extreme colors. This was arrived at by “try and see what happens” iterations, with absolutely no attention to the -k parameter. Reading the documentation for -k and @Entropy512’s response, I think I have some study to perform. For anyone else reading, here’s the dcamprof doc on -k:
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-k <LUT compress factor>, decides over how long range the out-of-gamut linear matrix values should be compressed at the raw level before being handled by the LUT. If set to 0 no compression will take place. The value represents the uncompressed range compared to the gamut limit (which is the intersection between the locus and ProPhoto RGB). If it’s 0.7 it means that 70% of the range is uncompressed and in the remaining 30% the full range up to raw clipping is compressed to fit within DCamProf’s maximum gamut. The default value is 0.7, and there’s normally no reason to change it.