https://www.prospectmagazine.co.uk/economics-and-finance/the...
This is UK focused but makes a pretty universal case.
I thought the "stag" part was stagnant GDP and we are even in a recession. The inflation part is there of course. Even if it's not stagflation, the inflation part is due to dumping trillions into the economy and super low interest rates. I expect there to be a lot of pain when it actually corrects, but since there is also a trade war and companies are bringing production back to the US, we might see low unemployment for some time. I dunno, it's weird.
They have had positive GDP growth above 5% since roughly 1990.
I don't think we're anywhere near the limits of human productivity, let alone all the ways we can enhance it through innovations and mechanical aids.
I think it's a fair question to ask, but then I'd say you'd have to prove we have reached a plateau.