退出成本Exit Cost
Exit Cost
解决什么问题What problem it solves
不用了，迁移走要付出多少。What it costs to migrate away when you stop using it.
这是什么What it is
停止使用某方案时，把数据与流程迁走的代价。
The cost of moving your data and workflow elsewhere when you abandon a given approach.
为什么需要知道Why it matters
和可替换性是同一件事的两面。它在选型当下看不见，出问题时最痛。Two sides of the same coin as substitutability. Invisible at selection time, most painful when something breaks.