I migrated to iCloud in Feb 2022. It was a bit tedious to change the email address to all services, for some I had to create a new account since changing email address was not possible. I like how iCloud mail has worked, I use the web interface on my work laptop and Mail apps on iPhone and Mac, I haven’t faced any issues with it.
Glad to hear no one was injured, could’ve been bad!
Narwhal version 1 seems to be working still too