> Start with the User Experience and work backwards to the technology you need.
I have a counter example. Founder of a very successful startup (early 2000's) once told me that they first built the technology (adding tracing to Java apps at run-time) just because it was interesting, without any clue if it can be useful to someone. Later they showed it to everyone and they got their first customer who agreed to try it (it required modification to JRE).
That sounds more like success in spite of a lack of market interest, not because of it. The amount of successful products that started on the inverse likely will massively outweigh these anecdotal experiences.
I have a counter example. Founder of a very successful startup (early 2000's) once told me that they first built the technology (adding tracing to Java apps at run-time) just because it was interesting, without any clue if it can be useful to someone. Later they showed it to everyone and they got their first customer who agreed to try it (it required modification to JRE).