I understand that certain nouns are both uncountable and countable at the same time.
Some of these nouns have different meanings in different form so choosing which form to use is relatively easy.
However, what if the countable and uncountable forms are actually quite similar in their respective meaning(s)? Or the difference may be so subtle that I can't meaningfully distinguish the two? How could I pick the correct one?
E.g. (the examples below may not be perfect and better examples are always welcome!:D)
(1) The programmer is working hard to enhance the functionality/ functionalities of the software.
(Cambridge dictionary: functionality (C or U) means the tasks that a software is able to do)
(2) The quality of this report, including its appendix and abstract, is/are disappointing.
(Cambridge dictionary: quality (C or U) means how good or bad something is)
(3) I dont know what my personality is/are. Sometimes I am warm and nice, sometimes I am arrogant and harsh.
(Cambridge dictionary: personality (C or U) means the type of person you are)
To clarify my question, I understand that a noun can have a number of meanings so this problem can be easily avoided by resorting to its other meanings (functionalities can be taken to mean a range of functions, but even functionality could mean the same thing, so let's focus on this meaning). However, picking a different meaning would effectively circumvent, instead of directly resolving, my dilemma.