yeah i mean, i forgot to say the enzyme replenishes itself, but because you keep dosing finasteride, it keeps getting blocked. eventualy you end up with constant 80%+ of enzyme inhibition or some value like that
when you quit, the body can make new enzymes , and over time less and less will be bound to finasteride, and when all the finasteride is gone, your 5ar is back to baseline.
or at least in theory for most people…except us it seems
i also think the crash is a witdhrawal syndrome adn wrote a lot about it