Short discussion about making a plan

Making a plan is very important and there is one saying that " If you do not plan, you have already planned for the failure"

Though plan is vital, a few people think that it has some drawbacks, claiming that ’ Life is what is happening to us, all the time. Also when we are making plan". So if we spend too much time planning things, other things could happen to us in the mean time.

How do you think about this?