Have you seen the concrete 3d printers by chance? My dad was smart enough to get 2 a few years ago. Not only did it cut material costs by about 50% in construction, we went from running a 20 man crew to a 4 man crew when running those things.
This is where the gaps in your perspective start, concrete 3D printing is incredibly niche, and would usually take more higher paid labor to be used in places that replace concrete methods. That’s not to mention the significant labor in their design and production.
That’s the same with medical AI, AI in general has a massive hallucination problem, but for diagnosis especially, just as many doctors are actually needed for the core part of their job- treatment and running the tests to gather the data for the AI in the first place.
The economy functions on people exchanging the product of their labor for the product of other people’s labor. The amount of useful things produced per hour of a humans labor going down is a good thing. It means we have to work less to live comfortable lives. Capitalism has been remarkably effective at that, it allows people to be as lazy as possible. Communist societies on the other hand, have had no incentive and therefore have not minimized human labor. Why invest in ways for people to work less? What benefit would the planner see in that, if they already have the people to fill those positions?
The one of the most arguments in favor of capitalism is innovation, and then people point to the several clear examples of centrally planned countries inventing something- but that forgets the equally important innovation. Innovation in production, which no centrally planned society has ever excelled at.