Ever since that back and forth about "East Coast being kind vs West Coast being nice" thing a while back[1], I think it's important to distinguish the two. Because they are noticeably different (at least to me) and shouldn't be used interchangeably. I want someone to be kind to me in a meeting. I think niceness could seriously inhibit progress. A kind person will tell me that an idea I have won't work, but they'll offer to help me work through it. A nice person will tell me that a bad idea is good, just to avoid conflict.
[1] https://www.upworthy.com/nice-vs-kind-are-east-coast-people-...