If we define website building as producing an integrated web presence that has specific definable and quantifiable results, then the process is incredibly complex and long term.
It involves hundreds of educated and tested decisions on details each of which affects the target audience acceptance and response.
Excessively simplified website builders feed into a "my brother in law can build me a website for free" mentality. Those ineffective sites convince potential clients of real website developers that their business isn't suited for having a website.
Overall most people don't know what's involved and are usually disappointed with their results.