taking finasteride once a week is totally dumb
How would you know.
It might be better than nothing at all, it's still suppresing DHT for a period.
Maybe some people are really sensitive to DHT-inhibitors and even finasteride once a day is too much and they can only handle a very scarce dosage.
Maybe that's why dutasteride is paradoxically bad for some people's hair, just like finasteride was bad for poster's and mine.