I agree with most of this, though I think it doesn't dive into the main problem: Freezing a whole system is practically impossible. What you usually get is a "

I agree with most of this, though I think it doesn't dive into the main problem: Freezing a whole system is practically impossible. What you usually get is a "piecewise" freeze. As in: you get to have a small portion of the system to not change for a given period. The real challenge is: how can you split your project in pieces of functionalities that are reasonably sized and replaceable independently from each other. There is definitely no silver bullet for how to do this.