I think they did the best they could and compromised where absolutely necessary to make it happen.
I don't think they thought they got it exactly right or believed that they had thought of everything. That's why they gave us the means to make changes.
I believe we owe it to them, and to ourselves, to be as deliberate in considering all aspects of issues as they were as well as honoring their intent and purpose.
Had we the wisdom to do so, we would have avoided Barry Soetoro and whatever his citizenship might be along with the fun of these last few years, not to mention the aftermath for however many more to come.
Instead, we get some detention after the school of hard knocks works us over some more. We used to know this stuff.
Again, no argument, but travel was probably not generally undertaken for the pure enjoyment of it. Your earlier description of it as a three input AND gate is apt, and I suspect they would have included an OR or two had they envisioned the world today.