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one cannot make something without a concept of what the final product will be
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I think this is generally true for things we create by design. But evolution works precisely the opposite way - incremental changes are made at random and only the ones that are improvements will continue to future generations. So small steps are taken with absolutely no specific end point to aim for.
This can be inefficient sometimes but it worked well enough for us to be here.
With humans, once we start dabbling with genetic engineering I doubt we'll have a fully formed plan that everyone agrees on. What we'll probably do is fiddle around here and there and in a few generations we'll have a completely new model for what we define as "human". There'll be a few surprises and probably a few problems.
When you're heading into an unknown future, you rarely have a clear endpoint to aim for; you just take small steps in the hope that you're headed roughly in the right direction.