From talking to people I know on support teams at hyperscalers and other tech companies: A mind-boggling huge portion.
But even as an AI believer and thinking it's great for this sort of thing, I also think if it's good enough for this sort of work, it should be good enough to identify when it's not capable of providing value, too.
Gosh, that's kind of sad. I hate having to wait 12 to 24 hours for an answer from AWS support - there's no way I'm raising the ticket without exhausting all avenues from my end.
