I felt the same and had mentally prepared for a factory reset, and all the pains that accompany having to re-setup a phone from scratch. I upgraded anyway. I

I felt the same and had mentally prepared for a factory reset, and all the pains that accompany having to re-setup a phone from scratch. I upgraded anyway. I have literally had nothing break or change for the worse, and moreover, the phone (Pixel XL) is noticeably more responsive. I was such a ludicrously smooth upgrade I have been actively looking for colleagues to compliment on the work.