We've had several: Mountain Lion, El Capitan, and High Sierra. I agree we're well overdue for another one. I was really expecting a "macOS Avalon" in 2020, but

We've had several: Mountain Lion, El Capitan, and High Sierra. I agree we're well overdue for another one. I was really expecting a "macOS Avalon" in 2020, but that of course didn't happen.