Engineering, and design, never really stops. It is a neverending iterative process.
Interesting to say this and then can't seem to understand why we should actually get cracking. A huge part of why all infrastructure is expensive in North America is the lack of consistency in simply building. All learning is regularly lost. Instead of building two subway stations every year, we'll do a giant 10 station extension that takes a decade to build and then do nothing for another decade while all that talent, experience and institutional knowledge is lost.
And heck, this isn't even just infrastructure. Same mentality contributes to the CAF struggle with procurement.