I don't see why people are surprised, it's hardware and that stuff pretty much never gets delivered on time. I'm pretty sure the original raspberry pi came out a year at least after it was expected to and OH MY GOSH was the original pi hardware absolutely awful. I think mine was so unstable it could only reliably run for about 10 minutes with nothing plugged in.

Now I have a number of pi3s that I permanently have installed and haven't had issues with. This is almost certainly going to go the same way and we just need to let them do their thing.