Science isnt about an ideology, its about data and the interpretation thereof. This post summarizes my point of view on that topic.
With regard to method variability and ref ranges these are good reads
This was before the T harmonization efforts; differences are mainly due to the different methods used
‘Of the 25 labs, there were 17 and 13 different sets of reference values for total and free testosterone, respectively. The low reference value for total testosterone ranged from 130 to 450 ng/dL (350% difference), and the upper value ranged from 486 to 1,593 ng/ dL (325% difference).’