I'm well aware of chip defect rates and how they affect chips.

>It's sexy and enticing. If someone can make it work that's awesome. I will remain skeptical though.

But Cerebras has made it work since 2019 as @cubefox pointed out. They're on the second generation already and they have been shipping to customers for years.

Here's a good overview of how they did it: https://www.anandtech.com/show/14758/hot-chips-31-live-blogs...