I’ve had one apart and to be fair they are not carelessly made. They’re jacketed in soft silicone under the braid and have thicker than average stranded conductors. You can totally use whatever cables you want, but theirs are built a little better than you’d think and they just feel nice.
Maybe this is a tactile/autism thing for me?
“They” include a shocking number of good people that are about to experience fascism against their will. Please don’t dance on the grave of victims.