Interesting point. The two stances are not contradictory. The end result is a new stack, so you are right saying that was the intent. However how you get there

Interesting point. The two stances are not contradictory. The end result is a new stack, so you are right saying that was the intent. However how you get there on a running system is through stepwise improvements based on componentization and gradual replacement until everything is new. Each new component clears more ground. I never imagined an A/B switch to a brand new system rewritten from scratch.