Let's look at your arguments:
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3d printing hasn't taken off: I think you underestimate just how important rapid prototyping and additive manufacturing has been in industry. Just because you don't see it doesn't make it unimportant. Here you can see some aircraft brackets that were 3d printed. https://www.metal-am.com/amgta-shows-additive-manufacturings-role-in-lightweighting-aircraft-engine-bracket/
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Corporate proprietary software. Neither cad nor LLMs are strictly corporate proprietary software. And I hate to break it to you but corporate proprietary software is not inherently evil and is commonly required in academic and professional environments. https://openscad.org/ https://medium.datadriveninvestor.com/list-of-open-source-large-language-models-llms-4eac551bda2e
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He cannot speak for himself.... It's better to parrot correct ideas than to articulate incorrect ones. Joking aside I don't see where you got this idea from, it seems he has plenty of creativity and aptitude for independent thought.
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What happens when chatgpt starts censoring answers. Most llms are already censored and by their architecture they are specifically designed to make shit up. So any reasonable implementation would review and edit the output, a point you yourself already caught on to so again I fail to see your point here.
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Is he going to carry a 3d printer? I remember hearing the same thing about calculators.
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Your doom and gloom conclusion. LLMs are a tool that can be leveraged effectively or can be used to fuck yourself over quite quickly. However your ludditical (ludditicarian, luddilicious, luddite-loving, what's the right word here?) prevent progress, allow fascists to take advantage of the fact that you are uneducated and endanger our society and those you love.
And don't criticize
What you can't understand.
Your sons and your daughters
Are beyond your command.
Your old road is rapidly agin'
Please get out of the new one
If you can't lend your hand.
For the times they are a-changin'