That's trivial to fix, just don't activate it when the proximity sensor says it's still in your pocket. Though I can imagine some other false positive scenario

That's trivial to fix, just don't activate it when the proximity sensor says it's still in your pocket. Though I can imagine some other false positive scenarios; like when you intentionally toss your phone onto a soft surface like your bed. The added protection is probably worth the minor inconvenience of having to reset the mechanism every time that happens though.