I think the biggest improvement in output compared to baseline humans would stem from synthesis between fields. At best a human can become a turbo-expert in a single field of study, maybe two if they're truly exceptional.
Being an expert in everything would let The Being see links between fields invisible to normal folk.
Imagine a master sculptor who's also an incredible portrait artist. Bam! Photorealistic sculptures!
It's not hard to imagine a field of maths linking closely with biology to produce statistical models for cell propagation. Multidisciplinary teams can achieve great things, but imagine that team is inside a single skull.
Australians are very sorry about Murdoch but please don't send him back, we don't want him either. Cheers.