Legal research is an area where a lot is just text analysis, but beyond a point, it requires a deep understanding of the physical and social worlds.
An AI capable of doing that could do a very large percentage of other jobs, too.
Yes. People are asking "when will AGI be at human level of intelligence." That's such a broad range; AI will arrive at "menial task" level of intelligence before "Einstein level". The higher it gets, the wider the applicability.