Landing on the moon 50 years required lots of specialized technology. Tens of thousands of people worked on the Apollo missions. Much of what was used was custom built, using the aerospace, electrical, and mechanical technology of the day.
For example, the industry base in the 1960s could create things such as precision mechanical devices, and customized analog electronics. That industry base no longer exists. But, there is a different industry base that can create awesome computer systems and better materials. So, it is still possible to build a moon mission, but doing so now requires customizing different technology. It is still difficult.
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