every app has its pros and cons, i currently use Open Camera, Snap Camera, Footej and Proshot
What LG calls 'autofocus' is what many 3rd party apps call 'continuous focus' and it is the behaviour whereby any motion on the phone will cause the camera to refocus (and thats where I think sometimes it gets problematic). The most noticeable fault is when shooting macro, if you shoot anything nearer than 5cm to the camera, focus is impossible due to the focal length, etc, but if you tap to focus and it remainsblur, the app actually declares a focus lock.
I havent really stress tested autofocus since I immediately switch to manual if auto is having trouble, but can definitely feel that autofocus is not very satisfactory. On all my 3rd party camera apps, autofocus fails to work when shooting in manual. On some apps like proshot, tap to focus doesnt work, etc.
Really hoping LG can fix their camera drivers in an update, so far its been 2 months and no updates yet.
Shame they cut out the laser from the older phones, think that might have helped in focusing.