Good video. Ethan Winer is always a voice worth listening to.
So as often in audio, it’s a question of application. Shielding is important when it comes to applications like cartridges and guitars, but maybe not so much for RCA cables.
Certainly not in my experience either.
I’d love to see Ethan revisit the contentious subject of speaker isolation/decoupling as it’s been some time and we’ve seen further developments since then.