People care way too much about their appearance/ appearances?
Google provides much more evidence for the singular but I have learnt not to trust it. In a formal essay I would opt for the plural since people do not share the one appearance, but I would like some clarification with this if possible.
The older question "On their back" or "on their backs"? is different from mine because the plural form has no other meaning. Whereas the word appearances, the plural can mean physical appearances as it can multiple looks. Furthermore, it would be incorrect to use the sentence "people love their life" as it implies they share one. Yet lives has two meanings as well. Why is the plural correct in that context? So I was hoping for an explanation on this.