You can trust the plan and have backup plans at the same time. They are not mutually exclusive.
I see way too many people in the camp of thinking "If you want to make other plans then you don't really trust the plan", which is totally wrong. Plans can get messed up. Plans can be attacked and disrupted.
Semper paratus should be the name of the game for all of us.
That is a salient point. Plus, there is no rule that a plan starts or ends at date X.
There has to be room for adjustments and flexibility.