As a Scrum Master I believe emotional intelligence to be considered a critical attribute for any role within an Agile environment, but I believe project managers require this in order to succeed in a project environment. For instance, having self-awareness, self-regulation, motivation behaviors will create a sense of ownership, respect, moral value and aspiration to the work in the project and add a sense of personal dedication and personal commitment to the successful completion of the project. These behaviors also signify the importance of emotional intelligence and the value of developing a comfortable environment for project teams.
Self-awareness, self-regulation, motivation are a few examples of the soft skills that project managers should exercise to create a more productive working environment that can lead to the success of the project.