"Robots can prefab things in factories, but it will be a long time before automated robots can build or repair anything on-site with the efficiency of humans + power tools. "

Thats the point. Robots are and will be for quite some time if not forever, pretty dumb amd needs human supervision for any complex task that cannot be encapsulated.

Also .. with climate change etc. etc. ... there is so much needed work to be done.

And population gets older ... and needs much more medical therapeuts, physicians etc.

So much pollution and garbage.

So much ugly things all around.

There is an endless amount of needed work around. And if the current economic system does not adjust for that, then there is something very wrong with that and not that robots doing shitty jobs.