Couldn’t it be said that some people do no need so much DHT inhibition as others to fight balding?

I think that the response to DHT blockers is not proportional to the speed of hair loss in many people.  I always use the analogy of a tug of war: the genes for hair loss pulling on one side and the DHT inhibitors pulling on the other side. The strength of the pull determines the effectiveness of the drug.  The blocking effect is fixed while the pull for hair loss varies with your genetic makeup.