I do find that knocking them down to find out why they were necessary is often a lot more efficient. Even at 37 that hasn’t really changed. But that’s a lot easier to justify when the impact of that decision is a bunch of process interruption at worst.
And being that efficient is fine, if you're a startup or a technology company. If you're the government, sometimes people die waiting on their treatment to be funded because of your efficient bulldozing.