Shockingly, the same thing happened when I set up the new Nexus 5X here. It used bluetooth or something to get my account details from the old 1+1, and then restored everything via Google (except for two sideloaded widgets) to the exact state/appearance as on the old phone.

From information on this BBS, that's something I did not expect.

I did have to add the two widgets (not available from Google Play), and install SuperSU ("rooting the phone") and Xposed Framework afterward, but that was all.