Part of the challenge of our current system is that much of the enforcement of our building codes is delegated to individuals who must interpret often very technical systems but who lack an in-depth understanding of the technology. This does not mean we need to replace the existing inspectors with engineers but there is a need for engineers to play a bigger role in training and supervising the inspectors.
We got to our current system through a system of experiments that have been informed by the engineering knowledge available at the time. Experience with problems shaped our understanding of how things worked. This is science. The opposite is magic. The problem with magic is that it does not always produce the desired result and in many instances results in wasted effort that made somebody feel good.
Stating that we do not need engineers is equivalent to expressing a belief in magic.
It is interesting that the belief that engineers are not needed predominately occurs on smaller projects predominately those constructed of wood framing. You do not see this attitude on large projects. The why likely has to do with the fact that these projects are often more tolerant of problems but I believe that certain personalities tend to gravitate towards these projects.
Yes some projects can be built following prescriptive rules
Steel Piling Services Saudi Arabia. This just means that you need to understand the limits of the prescriptive rules. The problem is that many individuals do not understand the limits of these rules or do not want to recognize them and want to practice magic while at the same time the regulations are driven by a belief in science.