Was there something specific from that thread you wanted discussed here?
My main takeaway was that Rust has been designed to support things like pre-emption (implemented as a budget after which a task yields to the scheduler) and work-stealing, which the C++ proposal does not(?). Note I haven't read the C++ proposal, just comments on that thread.
The counterpoint was that Rust currently requires
async-trait but that will go away one Rust has first class support via natively
async traits and TAIT.