“Self-organizing teams can decide everything by themselves. So they don’t need an architect.” writes Samudra Kanankearachchi on the Software Architecture group of LinkedIn.

This feels to me like one of these strange agile koans. If you repeat it often and long enough, it will gradually become the truth.
Self-organizing teams have very little to do with the architecture of your system. Self-organizing teams are about: task allocation, collaboration, communication, accountability, … it may have to do with time-boxing and therefore what gets accomplished in a certain time-frame. Architecture is about making decisions (choices) about the structure, composition, organization of the software system. It also feels like “architect” is necessarily not a member of the team. Not my personal experience or recommendation. Architect is a role, not necessarily a person (whose only role is to be an architect, though these exist in large organizations.)

Most systems tackled by small agile teams have a pre-defined stable architecture. So yes, they do not need to have anyone playing the role of architect. For novel complex systems, where architectural decisions need to be made, if they are made “by the team”, it means that the team plays the role of architect, and hopefully they have the knowledge and experience to do so. Like some teams have a scrummaster and a product owner, such teams should have an architecture owner, who drives the discovery of architectural issues and their resolution. Because an architecture is not going to gradually emerge out of weekly refactorings (another agile koan), unless this emergence is guided somehow.
Philippe Kruchten

P.S.: Agile Architecture by Scott Ambler

Every team member has a different view of what is more or less important. Their concerns are often focused on their personal responsibilities, not the project’s goals.
Dave Quick