The Pixel had (*had) the fingerprint reader on the back. For me that worked perfectly ergonomically-speaking. Plus, since it's on the back, I'd have thought it wouldn't be too difficult to have both face/fingerprint.
I used to have a Sony Xperia that had the fingerprint sensor integrated into the power button on the side of the phone. IMO, that was perfect because it could be unlocked either when held in one hand or when sitting on a flat surface. I think a single smartphone manufacturer managed to patent that idea in the US so it's not more widely used.
I have a Pixel 2 and a BlackBerry Key2; I much prefer the thumb reader on the Key2's space bar.