I feel like you're moving the goalposts slightly: Yes, all technology involves prototypes, development, gradual refinement to something production-worthy and offered for sale.

LaserDisc is an interesting case: is it failed proto-DVD, or its own separate thing? (analog, more like an LP than CDs or DVDs)

Not all technological innovations involves a failed attempt at commercialization. Microsoft really did try (and fail) to sell tablet devices with WindowsXP, https://en.wikipedia.org/wiki/Microsoft_Tablet_PC it wasn't just a prototype that they experimented with and then shelved until it could be refined later.