It's a bit encouraging to read about Edison's flops too. All my failures have just been preparation! One was a kind of 1890 Optimus, dolls he called "little monsters" with a built in miniature phonograph.

https://en.wikipedia.org/wiki/Edison%27s_Phonograph_Doll

I am impressed by how much of commercial success is a matter of the product's tastefulness. Chamath Palihapitiya said this and I have to agree. It is easy to Dunning-Kruger your business to death without it.