Honestly, what we need is a massive bug fix.
I'm definitely seeing a huge issue with restoring TimeMachine backups and Migration Assistant (transferring my data to the new Mac) issues over wireless. During the restore, and about every hour or two, something happens (possibly a timeout) and the destination Mac prompts for the Time Machine credentials again. Other times, it just sits there, with a message that it's "trying to re-connect" providing the "helpful advice" that the TimeMachine has to be on the same network segment. No traffic goes over the network... After an hour's time passes, I grudgingly restart the Airport, and it still didn't re-connect.
It's like the error message is supposed to re-authenticate, but that actual software/code that doesn't exist, so you get a text box saying it's doing something, but it's not doing anything at all. No traffic goes over the network.
I tried doing a Mac-To-Mac restore, but the source computer has faulty M.2 controller (IOKit Errors in the system logs), Migration Assistant won't see the system if it has a a kernel panic and reboots. It (again) fails to resume the restore if the source computer reboots.
TimeMachine restores over USB (in a Recovery boot) just seem to sit there, no backups are detected on the TimeMachine drive. It just sits there, with a different-colored box where text to select a system should be. The only way to restore is over a network connection.
I imagine TimeMachine and Migration Assistant restores of backup data are going to be a bigger issue after Christmas Day. I eventually got it to work by using dongles and setting up gigabit ethernet connections on a dedicated router, not connected to internet. It still timed-out. I just happened to be near the machine when login credentials were requested.
