Imho the best compromise was the lockscreen on the pre-Android Blackberry smartphones where you have to move a grid of random digits so that the right digit hov

Imho the best compromise was the lockscreen on the pre-Android Blackberry smartphones where you have to move a grid of random digits so that the right digit hovers on the right spot of a picture. Safe against onlookers, not reliant on biometrics and still quicker than entering a password. But right now I doubt the fingerprint sensors will go away soon, nothing really beats them in terms of convenience.