All new technology needs to be tested out in the world

This is because of secondary effects. The effect of a technology in the world only comes into view after it has been deployed in the world for some time.

An example of this is drive-thru restaurants after the introduction of vehicles, or the accidents that are a product of there being millions of cars out in the world.

You can test something, have a theory, do tests in lab, etc. but it’s very difficult to come up with second degree effects of a technology.