Being kind can be more concise. Here is an example that my fiance recently pointed out...
I think the single biggest mistake people make in communication is reminding the other person they are incorrect when that does not change the content.
"As I told you Monday, the reason is X."
"I have not heard from you when I asked for feedback, so I am following up."
"We could have done it the other way, but since you already set it up, let's use this."
It is amazingly tempting, almost everyone does it, and your communication becomes an order of magnitude more benevolent when you edit those clauses out.
For more ideas on how to be concise and kind, I highly recommend the parenting book, _How to Talk so Kids Will Listen, and Listen so Kids Will Talk_. It is not just for parents. What works with 13 year old kids also works with 30 year old kids.