I need to get better with my wife.
I think this should take the highest priority. As they say, happy wife, happy life haha.
But I do agree with what you are saying. Unsolicited feedback is useless, giving it to an unwilling person makes no difference. It should be something they can work on, and it would be nice if you can help them with it. Being short and specific can be good with people one isn't that close with. One can then expound once they ask for more details.
It is a great saying - until reality sets in and the realization is made that they are never happy for long.
Giving good feedback both positive and negative has so much organizational value, and over time when people benefit, it builds trust.