FYI shed is not hair loss. It's usually the result of a sudden change in hormone levels. All hairs go through a cycle of grow, pause(rest), fall out, then restarts by growing again.
Loss is the gradual destruction of hair producing stem cells in the follicle, causing the strand to grow thinner and thinner over a long period of time until it disappears.
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Obviously systemic type 2 generated DHT doesn't all reach your follicle stem cells. But type 1 produced DHT on your scalp is right there, doing a disproportionate amount of damage.
TLDR DHT attaches to receptors on the stem cells, causing them to lose their "immune privledge". The immune system attacks the stem cell, creating inflammation, which eventually leads to the death of the cell.
So while shed can happen fast, it's temporary, while loss is a really slow, gradual process like a smouldering fire burning up the hair producing factory. Male pattern balding happens in the order it does because the follicles (front and crown) have the most DHT receptors, so they get killed first.