If aftermarket premium power cords work, why won’t short runs of premium XLR cables work?

I have followed many threads, where people swear premium power cables greatly benefit your sound.  I haven’t decided, as the last time I tried a power cable was twenty years ago.  I used a Transparent power cord and was on the fence.  If adding a power cable improves the sound and it’s only the last few feet of your voltage source, what would make extending a premium XLR cable any different?  If I understand the argument, per se, the premium power cord acts as a filter.   XLR cables are mostly unsupcetable to outside interference.   I’m sure I will be versed here one way or the other.