The question is if a better cable can help with poor implementations?
From what I've read of the reviews here for questionable products like boutique cables, filters, reclockers, power supplies and power conditioners, variations of your question come up consistently in those threads.
But isn't the right question how to identify poor devices, not how to fix the problems they introduce? A correctly designed device is very tolerant. A poor one requires special upstream and downstream care.
Really, the market for boutique cables and other junk can't help but suggest your question. That market revolves around products that target the subpar, the suboptimal, the broken, etc. which at best have zero postive effect in an adequate system despite charging a premium.
"How good is your product?"
"It's really good."
"It's worth the extra money?"
"Yeah."
"I have XYZ device. Will it improve its performance?"
"No, not for that one, but if you own other stuff like ABC or DEF or, you know, have a lot of electronic interference around the house, it will definitely do the job."
"Definitely?"
"Well..."
"Are you saying I can save money down the line by buying cheaper, shittier stuff because your product will make sure it works better?"
"I can't guarantee that."
"... Is your company owned by an insurance company by any chance? This sounds like one of those 'in case of earthquake' addendums."
"Um."
"At least you don't have a subscription model."