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Er, I sort of do think that's how it works? The ultimate rebuttal to "you can't do X" is to actually do X. Until you do that I think that ultimately the burden of proof falls on you. It can be very easy to imagine certain tasks and systems can be automated - especially when you aren't actively involved in those tasks and systems and are unfamiliar with their intricacies.
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You: why don't we have a universal cancer vaccine?

Me: [ insert specific example of currently intractable problem ]

You: sounds like an excuse

Me: okay... can you explain how it could work?

You: THAT'S NOT HOW THIS WORKS

okay

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More like:

Me: Why don't we use radiation to treat cancer?

You: Radiation is dangerous

Me: Sounds like an excuse

You: OK, design a medical-grade synchrotron

Me: That's not how this works

You: LOL pwned

...insert specific example of currently intractable problem...

What makes the problem intractable? We can now do both voice recognition and synthesis at human levels, and any video game programmer from the 1980s can keep some objects from running into each other.

When an emergency is declared, keep the other objects in a holding pattern and give the affected object permission to land. Then roll the fire trucks. Preferably not routing both the trucks and another aircraft onto the same runway, as the humans apparently did here.

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> What makes the problem intractable? We can now do both voice recognition and synthesis at human levels, and any video game programmer from the 1980s can keep some objects from running into each other.

Great point!

It must be that despite the reliability, obvious advantages, and accessibility to "any video game programmer from the 1980s", everyone else is just choosing not to do it.

Alternatively, these things are not as simple or as reliable as you, a person who has no familiarity with the problem, assumes them to be.

I guess we'll never know ¯\_(ツ)_/¯

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