Again, this is your own bias rooted in the fact that most SV/tech people in bay area think you have to launch a product as soon as possible and that's the only way tech has ever been developed. It's not the only way, and the agile model that works well for web stuff and consumer/B2B applications often isn't suitable for other kinds of technology development, where there is a custom hardware component.
If you want to see a lightfield display you can just visit Display Week (http://www.displayweek.org/). Once you see one in person your doubts will be put to rest.