"It can increase your efficiency"

So you have a shop with 50 developers. But in a few years the new AI tools increase everyone's productivity by 10. So now you only need 5 developers to produce the same output that you had before. If you're lucky/smart/well-connected/charismatic enough to be one of the remaining five, great. But the other 45 are unemployed.

And if that phenomenon happens across the economy so lots of people are unemployed, i.e., recession, then the demand for whatever it is your shop made may also go down, so some of the remaining five may also lose their job.