I am completely on board that perception in sound is very subject between analog components, but digital cables, can not in any way affect the delicateness, timber, or whatever excessive use of adjectives you decide to make use of. The can either deliver the data stream reliably, or not. If they can not deliver it reliably, it would be perceived with either pops, crackles or dropouts. There is not mild affect that can roll of frequencies or add warmth. It just is not possible no matter how much you want to justify your purchase.
They do not carry an analog signal. The only components that can affect the quality of the produced sound are components that either convert or transmit analog signal. Digital cable carry a stream of 1's and 0's that do not translate to perceivable audio. There is nothing a digital cable can do but either deliver that stream to you reliably or not. The average cable that can be bought at your local computer store will only drop a single bit at the rate of 1 per 10(12) power which is 1,000,000,000,000 bit. Keep in mind that there are 5,872,025,600 bits on an audio CD.
Think of it this way. Take an original CD an compare the sound to an undamaged copy of the cd, or even a lossless digital format move to a computer. These sources processed by the same DAC will not sound any different. I am sure most of you have had cd's not read properly, an as you know there is no in between with the sound quality, it either drops out or plays. You don't hear warmth, sparkle or any other5 cent adjective as a result of the digital data delivery.