I think it's to rein in the "pink cloud" impulses that might lead to rash decisions early on.
All of a sudden, you're feeling healthy, you're sober two months, you've gotten in touch with your spiritual life (maybe for the first time) and anything's possible.
So you quit your job at the insurance company, cash in the 401(k) and step off that treadmill. A couple months later, things might not have turned out exactly as you'd imagined and it's all sobriety's fault!
Things were soooooo much better when you were drinking.