Jamie is right, if ur audience is impressed by your dexterity or say OMG u are really fast with the cards, u pretty much failed as a magician if u are trying to perform magic. (no disrespect to cardistry)
personally i do use some cardistry in my own performance as well, but the emphasize should always be the magic itself and not the flashy displays. some fancy Fan here and there is great when u try to let the spectator pick a card or a lepaul spread when u try to display the deck is a regular deck, those doesnt overshine the effect u are going to perform yet set up a standard that u know ur way around the cards, i found setting up a standard, an expectation from the audience beeing very important, also using flashy moves as an added touch of humor is great, for example u spread a fan withhold some cards when ur spectator is choosing a card, then do the siamese fan or other variations and say "or wait perhaps u want some extra options." is really great, but then again magic is a performance art, that means what works for me doesnt necessarily work for you.
but yes alot of those ultra fancy cut from cardistry are really useless for any magic effect. but it is ok to use some small short less fancy ones for a fake cut when trying to control the card, that means it wont last more than 3 seconds.
Currently im testing some routines that end up having cards in the position for either long distance spinner/hotshot cut/boomerang.