[ram_rar]

>The other reason is that you cannot split up a large established codebase without first understanding it. I have seen large codebases successfully split up, but I have never seen that done by a team that wasn’t already fluent at shipping features inside the large codebase

I cannot resonate with this. Having worked with multiple large code bases 5M+, splitting the codebase is usually a reflection of org structure and bifurcation of domain within eng orgs. While it may seem convoluted at first, its certainly doable and gets easier as you progress along. Also, code migrations of this magnitude is usually carried out by core platform oriented teams, that rarely ship customer-facing features.