I'm sure it's not the app switcher, as this occurred with a locked phone. Pressing the home button did not fix it. Only pressing the sleep/wake button twice would fix it.Are you sure the 'blank lock screen' is really the lockscreen? It could be a bug with the App Switcher, where a Home button press can solve it.
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Your opinion. My eyes and brain can keep up just fine.Continuous scrolling means users can't see the emojis until it stops scrolling instead of a quick scroll and stop. It's a user interaction downgrade.
Actually Apple could rectify this. A quick swipe could result in a fast scroll and stop, whereas touch and drag swipe would result in continuous scrolling.
Both user interactions could easily be addressed.