Why is it bad to make big decisions, especially when an extremely flawed model that has been in place for the past ~20 years is finally changing? (Fear of chan

Why is it bad to make big decisions, especially when an extremely flawed model that has been in place for the past ~20 years is finally changing? (Fear of change aside) To compare, Apple makes big decisions like this fairly often. People complain, get over it, and the world is usually a better place afterwards.