#2 is a big thing

I have an actual work service that uses a specific rule engine, which has some performance issues.

I could just go to Codex Web and say "try library A and library B as replacements for library X, benchmark all three solutions and give me a summary markdown file of the results"

Then I closed the browser tab and came back later, next day I think, and checked out the results.

That would've been a full day's work from me, maybe a bit more, that was now compressed to 5 minutes of active work.