Welcome,

No, they do not. With whatever speakers.Speaker cables make a clear difference with the Kantas.
It's Purifi.the Purify
Why "no surprise"? Just because these are more expensive?Clearly more revaling than the Arias (no surprise).
Nonsense. A speaker cable is a passive component and has zero influence on distortion. Worst case scenario is a resistance too high that may affect HF frequency response but it would be very unlikely with any 2.5mm2 (and not 2.5mm) cable under normal domestic lengths.Love the bass punch and bass stretch downwards, but the sound was fatiguing on the Kantas (much distortion?).
You will lose a lot of time to do so. Unless to temporarily satisfy your expectation bias. Weeks/months after, you will just want to try new ones...Also I will probably try some different speaker cables after that.
That's explain a lot. Guess what they will say: the pricier the better.I need to check with some professionals what they recommend.