I suppose A.K.'s statement is one up from a UK pro tier, the late David Collier, who went on record stating that any fly he tied and sold which lasted long enough to hook&land one fish offered the angler adequate, or even excellent, value for money.
I did not agree with David then, and while I have no issue with the actual A.K. verbatim statement as referenced, I do have reservations regarding the underlying sentiment on fly durability.
I prefer, and expect(!), my flies to last well beyond one or two fish (though I might make a rare exception to this in the case of a two foot trout
)
Cheers,
Hans W