It's the 'Death of a Thousand Cuts" kinda thing. A 10 foot cable doesn't seem very different from a 15 foot cable, which doesn't seem very different from a 20 foot cable, which doesn't seem very different from a 25 foot cable, which doesn't seem very different from a 30 foot cable.

But if you change from a 10 foot cable to a 30 foot cable, you'll immediately notice loss of definition and openness.