People in my team tend to express their mood in project context. Yet they find it valuable to know somebody has a bad day, so to not take his mood as something

People in my team tend to express their mood in project context. Yet they find it valuable to know somebody has a bad day, so to not take his mood as something their actions had created. It has not raised anybodies anxiety or made them feel exhibitioning private matters they would like not to share. It also makes them feel comfortable they can express themselves in an open way. It may not work with all teams and all environments - yet my feeling is that such environments and teams have other stuff to work out to build space for comfortable exchange of opinions and feelings. There are many guides for effective feedback which base on expressing how actions or behaviour of a person you give feedback to impact feelings. So I guess it's worth exercising ;)