fancy ground Stainless Steel cables are less flexible than the cheaper galvanized ones.... Chrome makes "stainless steel" stainless", and chrome is very brittle. Frankly, once the cable settles in to the bend, it won't be an issue, no matter what the cable is made from.
If a bike is ridden regularly, Shift cables should be changed about once a year anyway.. MAYBE every two years, depending on how often the rider needs to shift during rides, and if the bike has brifters on it...

ever spent an hour or so getting a cable remnant out of a brifter? i have.. it sucks. imagine doing that along the side of a busy highway.... a SAG wagon arrives.. it's fully loaded.. and the "mechanic" onboard is not really a mechanic, just an "eager to help" kid with no actual parts, some harbor freight tools, but no pick awl... and you are obliged to explain why you won't be needing his help... while digging out the cable end with a tiny screwdriver meant for adjusting limit screws (That brifter was never quite the same).... along a busy highway... as the rest of the STP riders pass you by... ten miles from the finish line.
the cable remnant came out about two minutes after i finally chased the sag wagon dude away... the new cable slid in easily.. almost as if the bike said " we've tortured him enough for NOT SWAPPING in new cables sooner!"...

PS.. "cable stretch" is an imaginary issue, once the cable settles into place.