Regarding users creating new accounts on phone setup:

Recently I encountered a user that had created a new Google account when switching to a new device... on their last 5 devices.

So when they switched to the latest one and called me to set up the phone, I had to wrangle the contacts, photos, cloud storage and whatnot from all of those accounts.

Another pain point for me (in the EU/Balkans) is the transfer of Whatsapp and Viber. For reasons unknown, the accounts, contacts, chats, downloaded data can't be transferred during device setup. The only way to transfer data to a new device is to create a cloud backup on the old phone, which requires creating a wapp/viber account and setting up the google drive backup (local backup to a file? lol no. Any other cloud service available? lol no). Of course, when dealing with a media-heavy user (lots of photos, lots of memes/videos from group chats that are automatically downloaded to the phone), often is the case that the cloud storage tied to the google account doesn't have enough space for the backups, because it is filled with the automatic google photos backup that nobody turns off. And the user usually doesn't want to pay for extra space on Google because they don't understand why or just plainly don't want to.

So yeah, the transfer process is slow and complicated and full of traps, but it also offers an insight in to how much the imaginary "average consumer" doesn't care about this stuff and just agrees to everything offered.