BuddyPress.org

Did raise that a while? back, not sure it inspired much interest, but you would need to define whether one was dealing with general UX /UI or the default theme, from a theming point of view not child theme necessarily , but full on theming some UI / UX is merited along with other issues such as identifying markup that needs removing from core if applicable and aspects such as better handling of activity_action which isn’t fun to deal with from a frontend perspective.