The nerds aren't jaded, they are worried. I'd be too if my job needed nothing more than a keyboard to be completed. There are a lot of people here who need to squeeze another 20-40 years out of a keyboard job.
You're assuming that keyboard jobs are easier simply because the models were built to output text, but nothing prevents physical motion to be easier simply due to sheer repetitiveness. In fact, you can get away with building dedicated robots e.g. for drywall spraying and sanding, whereas the keyboard guys tend to have to switch tasks all the time.
Similar comments were made that microwaves will eliminate cooking.
At the end of the day (a) LLMs aren't accurate enough for many use cases and (b) there is far more to knowledge worker's jobs than simply generating text.
