I was happy to see coroutines make it in but some of the concerns raised about the design seemed to have valid points. I'll be interested to read the papers mentioned when they're available to see how a consensus was reached and what the plans for the future are.
There were at least 4 different competing coroutine proposal at the last mailing. I guess the committee didn't see any hope and convergence and just opted for the more mature proposal.
https://herbsutter.com/2019/02/23/trip-report-winter-iso-c-s...