Yes that can happen, I wouldn’t want to work somewhere like that either. “Why isn’t this done yet?” Answer: It was a ballpark estimate. Now we know more infor

Yes that can happen, I wouldn’t want to work somewhere like that either. “Why isn’t this done yet?” Answer: It was a ballpark estimate. Now we know more information we can revise the schedule. That’s all you can do as a non-manager. If the company culture makes your employment unenjoyable I would start looking for a better workplace, or find a coping mechanism to deal with the resulting poor management.