"The email and other data in your account remain untouched when you migrate to a new username, and you will continue to receive mail destined for your original address."
"Google also notes that the old username remains attached to your account as an alternate, and you can switch back to it at any time."
"If you use a Chromebook, for example, changing your username requires you to log out and back in to the machine."
"Most other issues should be short-lived and will clear up after a few hours or a device restart."
When migrating to a new Google username, email and account data remain unchanged, and users can log in with either username. The new username becomes the primary identifier, while the old one stays as an alternate. Some services may still show the original email. Users cannot delete new addresses, potentially leading to multiple aliases. Changing usernames may require logging out of devices and backing up local files. Most issues are temporary and resolve after a restart or a few hours.
Read at Ars Technica
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