So, about that Galaxy S8 fingerprint reader positioning...
Yes, according to the leaks, the home button, which Samsung has had for years, will be gone from the front — due to the phone's bottom bezel being so thin, no doubt — and will be moved to the back. But, to our surprise, when the first visual leaks came about, they showed the biometric sensor not to be in a central position on the phone's behind. Nope, it's offset to the right of the camera, causing us to wonder whether that would be comfortable and how many times we would accidentally smudge up the camera glass, trying to reach the scanner.
Things that are NOT allowed: