It’s nice to see the Scrum community finally accepting the importance of Lean and Kanban. But putting Lean/Kanban practices into Scrum does not make Scrum the same as Lean.
Perhaps the biggest different between the two is where our attention is when we have to remove an impediment. In Scrum our attention is “how do we remove the impediment by being faithful to Scrum’s practices.” In Lean, there is no attachment to any practice. Instead we ask “how do we remove the impediment by attending to Lean principles?”
In Scrum’s case, the assumption is that the team will figure out how to alleviate this impediment. But the best solution may not include having a stable team. For example, when multiple teams are working on a common codebase it may be best to dynamically form a feature team to work together (think of this as spontaneous mobbing).
This is a practice that I first used over a decade ago when test platforms were highly constrained. Immediately worked well and adoption was simple. The 7 teams that worked together to do this were following Scrum (with difficulty) before shifting to this model. Afterwards, they were no longer doing Scrum. We had to think in a Lean way to get to a Lean solution.