Earlier quoted context omitted.
That's too low of a standard imo: just knowing something is possible and what that specific thing is, confers a lot of useful information.
However, that argument also suggests that trade secrets are not much of a barrier to innovation.
Consider the case of nuclear weapons. The first big leap is that the energy of fission can be made to be explosively released. Once you know that this is the case, most people in the field might be able to come up with something along the lines of a gun-type warhead.
On the other hand, implosion devices, even if you know they are possible, still require a huge amount of work and design studies to make work reliably. Knowing that they are possible isn't the hard part--making it work is.