True, but I wouldn't think any grayscale changes would make a big difference to the recommended brightness or contrast settings. Maybe some but it would be pretty minor.
Sharpness shouldn't be affected at all.
If we aren't comfortable going into the service menu, will these basic settings still be accurate or do they become worthless without the service menu offsets?
TC-P42X1_50X1 Pre Calibration Report.pdf 208.8603515625k . file