It is a naive and innaccurate expectation that training people in interpersonal, social and emotional intelligence skills will necessarily lead to higher quality and density relationships. In the same way two neighbors can be expert in people skills and yet have little or no quality connections, people at work can be skilled and disconnected for all sorts of reasons. There are people for whom introversion is not a lack of social skills but rather a choice.
Working to connect people is its own art form and responsibility. We have it explicitly help nurture and build new and stronger connections between and among people. It's more than making the better skilled. It's actually creating and growing the quality of connections. The spiral dynamic here is that the better people are connected, the more easily and likely they are to engage the social skills they already have.