For my part on LH I find them wide of the mark for the exact reasons "I'm off" and "full wings" stated.
Feeling they were designed in a room that had a mixture of commercial pressure from operators with silent regulators playing yes men and compliant psychologists who've never worked shift reversals coming up with what the pay masters want to hear. No account has clearly been taken of what the long term damage is to a human doing this for decades. Doesn't matter as all they're interested in is "fatigue". When people fall off their perch in the 40s/50s/ 60s because of diabetes, cancers, psychological ill and heart problems they'll put these down as outliers and not related.
Fascinating reading.