Thank you for taking your time to reply. Yeah i believe i mentioned the deciding factor is if the design is realistic, that definitely includes cost and demand for it. I’m sure someone will pay top money for Gina or Taiki if they decide to sell it (definitely not for the mass market).
Well to be very straight ,your MP3 player is already outdated to date and thus not realistic to the market (even though it’s not going to cost as much as a car). But all things are relative and that design will probably be too “expensive” and unrealistic when compared to what’s available now.

Anyway most companies come up with such concept so as to push the boundaries, to create something with no restrictions, hoping to gather insights on how things could be. They are not wasted as things learnt from doing those concepts will be valuable.

I think you are getting a little confused. The difference is where you are taking the product and the extend of the possibility of taking a product into manufacturing. The objective of Un-p3 is and was to take it into a production. You make prototype, basically to test it before you get it made in numbers. The Taiki and Gina are one-off products that are probably too expensive to be realized. They are quite far up the food chain in terms of realization.

Interesting that you ask, that project had 2 objectives. I challenge to myself how far I can take a design working only with a standardized PCB and real world mechanical constraints, and to understand concerns people would have buying electronic products online.

Oh, I would not class them as “Concept Products” as discussed in this article, they are actually fully functioning prototypes.