What is lying, one might wonder? This refers to the absence of truth, for various reasons.
Yes, I agree with the prompt that not all lies are equal and not all are unnecessary.
Some lies are used to protect one and his loved ones from immediate danger and harm, some are used to cheat and to deceive, some lies are used to prevent someone from getting hurt over an uncomfortable truth.
Should they all be categorised as one?
I say no.
However, I must add that when lying to prevent an uncomfortable truth, the tag "harmless lie" is misleading and this should only be used when only necessary.
Lying to a loved one would hurt them more in the long run and you would lose your credibility.
Not so harmless now, is it?