Sigh. I guess I wasn't explicit enough.
It turns out, if you are manufacturing original products for mass production, you are doing ID. So yes, there is no path to success manufacturing original products without doing ID. I wasn't implying one needn't have ID any more than your comment implies one needn't have engineering.
What I was referring to your comment about "hire a top-notch industrial designer" to produce distinctive designs of impeccable taste.
Yes, products with exceptional ID will sell in major ways.
It turns out, that products that are exceptional in a lot of dimensions sell in major ways. Products that are exceptionally inexpensive sell in major ways. Products that are exceptionally marketed sell in major ways. Products that are exceptionally well engineered sell in major ways.
...and if everyone is employing exceptional ID, then doing so yourself doesn't actually make your product exceptional.
And no, customers don't "notice the smallest details, perfection in every aspect of the product". There are some products that certain customers fetishize and absolutely do notice this stuff, but the vast majority of products people interact with on a daily basis barely register.
I agree that ID is a short cut for communicating quality to customers. Sometimes you shouldn't take the shortcut. Sometimes it's better to take the long way around.
Great ID can work brilliantly as a marketing tool as well as a tool to deliver actual measurable benefits to the consumer. Great engineering can do the same. Having a unique value proposition (which I'd argue is System76's case) can do the same.
There's more than one kind of market success and more than one path to market success.