9/9:Platform eng. can scaffold a reliability mindset for product engineers by providing a causal understanding of systems _below the line_ and by helping connect the dots with systems _above the line_. A balanced and coherent view of boundaries gives confidence to evolve them in the right direction.

2/9: Infrastructure Gravity leads us to pay attention to cloud concerns: how data is stored, processed, and transferred between components.
Feature Lift is about product concerns — a field of relevance: how many opportunities for meaningful interaction the data allows us to realize.

I like these visuals. Linked lists and B-trees are exactly how I represent remodeling in my mind. When you’ve worked with a domain for a long time, you start remodelling it to better fit concurrent product streams and to ‘activate’ their velocity.