Realizing that "the way things are is the way things are" brings freedom from the burden of judgment and allows you to embrace reality.
Here and now there is only the situation in which you find yourself. Wishing you were somewhere else, doing something else, with someone else, is a recipe for discontent and poor outcomes.
Does this mean you have to like the way things are? No. Just let it be.
Does this mean that things have to stay the way they are? No, nothing ever stays the same. But, how can you "see the ball, move the ball" when your UC is blinded by unhelpful memes and disabling emotions?
Realizing that "it is what it is" allows you to be fully present.
When you fully accept that "it is what it is," you see the situation clearly. When you are fully present, you are able to see what needs to be done here and now, and what your role in that is.
When you accept that it is what it is, you no longer stimulate negative emotions with thoughts of how it "should" be and how unfair it all is. When your mind is not trapped in memetic "shoulds", you are free to look around you at how things really are and how you can best help out.
First accept. Then act as the metaverse leads.
Here's how Eckhart Tolle shares this meme in his book, Stillness Speaks.
When you completely accept this moment, when you no longer argue with what is, the compulsion to think lessens and is replaced by an alert stillness. You are fully conscious, yet the mind is not labeling this moment in any way. This state of inner nonresistance opens you to the unconditioned consciousness that is infinitely greater than the human mind. This vast intelligence can then express itself through you and assist you, both from within and without. That is why, by letting go of inner resistance, you often find circumstances change for the better. (p.68)