I'm not quite following. If a person wants a timascus knife, then a knife without timascus would be deficient, would it not? Timascus being a necessity to meet the demand for a knife with timascus.
In the OP, it was asked if 'hard use' knives from years ago were no longer 'hard use'. I took that to mean that the past knives are not able to meet some modern arbitrary performance requirements to meet the definition. Isn't that being deficient? Not having the capabilities required for a certain classification?
ETA: here is a thread on abuse I started a couple years ago. The thread starter was not registered back then, he may/not find anything of interest in it.
http://www.bladeforums.com/forums/showthread.php?t=564289
We need to make some distinctions. First is that between desire and "necessity." The question of "deficiency" should first cover, "A deficiency in what, exactly?" There appears to be at least two uses for necessity here. One is in the functionality of the items in question and another is in a person's buying criterion. This provides at least two aims that need to be met: the cutting job and convincing someone to purchase an item.
If we're honest with ourselves, we can get most cutting jobs done with a relatively cheap blade. If the blade breaks off of the folder, we would still be capable of finishing the job if we got creative. If we were stuck alone on an island and our folder's blade broke off of the handle, we could still find a use for that blade (hold the blade itself for cutting, tie it to a stick, etc). The only "necessity" for the aim of the cutting job would be something sharp that could separate the material. Anything above that is simply a matter of convenience to whatever degree.
Timascus from the standpoint of knife functionality is irrelevant. Its only "necessity" lies in getting the guy that "must" own timascus to buy the knife in the first place. In that sense, sure we can call it a "necessity", but it's getting pretty close to blurring the lines between needs and wants.
Judging the usage of "deficiency" in Boat's posts within his context, he appears to be making the claim that because one's desire increases for X feature in a knife, it necessarily implies that a needed function is lacking. This doesn't necessarily follow as far as I can tell since the purpose of the increased desire is left ambiguous. This provides the room to switch definitions from the criterion for buying to the functionality of the knife- a non sequitur.
As to the added performance of hard use knives, I don't think there's much controversy there. The controversy seems to lie in the question as to whether or not that added performance is something to be reasonably desired in a folder or not- a matter of subjective preference rather than one of physical limitation. And since we're talking about desire and not necessity of functionality for cutting (eg, a blade is generally
needed for cutting), all the hoopla about judging hard use knife fans looks a lot like the pot calling the kettle black.