I had a Maxx back in the day, then it's successor, the OG Droid Turbo
Last week, I jumped to the new Pixel 2
IIRC, they never did get around to rooting them
I worked in Wireless for a time, and there's a point where being stubborn and "why won't it work, it's still good" just makes you want to put the thing through a wall
If pure Android, and fast frequent updates are your needs, you really can't beat a Pixel