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Hindsight. Juicero is so obviously a stupid failure now that we know it is. We can't even imagine a world where it wasn't stupid.

Now try to remember a tech/company you thought was stupid that became a massive success. For me, I remember thinking wifi was stupid -- I was a power user, laptops were grossly underpowered circa 1998. Why would anyone need wireless internet on a desktop?

I keep that story in mind because it keeps me humble about hindsight bias.