Clinging to the Sacred Order of the Cards as if it's some divine gift to us mere humans is silly. When someone cuts (or declines to cut) prior to the deal, that doesn't somehow bless the current order of the cards. It doesn't mean that that exact arrangement of 52 cards must be used for the upcoming hand, or else the game is unfair or something.
But the problem is that when you shuffle the deck, it is very likely the only time in history that the cards have been ordered exactly that way. If you deal to an empty seat or make some other procedural fix that doesn't maintain the Sacred Order of the Cards, you've lost your chance to play with that particular ordering forever.

and the flop was 
) and you failed to bring it to the dealers attention, your hand could be ruled dead and the pot awarded to the other player.