On large scale scrum programs or scaled agile portfolios it is often easy to have people come and go from the village without all of the community knowing.  

Scaling Agile is often daunting and seems unattainable for many large enterprises. The Scaled Agile Framework team and contributing consultants have pulled together case studies to share the journey challenges and are freely available

To kick start the growth for Architects and Designers I've been running a series of learning workshops that focus on developing the thinking, behaviour, principles, and practices of Agile Architecture and Design.

Scaling Agile is as organic as the humans involved. Regardless of the methodologies or tools you bring; a successful and sustainable scaled agile program depends on a good human foundation. Agile is driven by people and molded by company culture. People and companies have underlying and historic values that need to be relinquished or evolved, otherwise they will rust any practices you put in place.