It seems to me that this is a basic military and strategic principle, that if you want to control the initiative, you act. You may deliberate, check data, assumptions, all that good stuff, but then, at some point, you are Eisenhower, and it is June 5, 1944.
The weather was poor, and forecast to get worse, save for a narrow window predicted by the meteorologists to last less than a day.
If he didn't pull the trigger then, he had to wait another month, best case, one more month for the Germans to maybe correct some errors as to what the Allied plan was, as to risks of waiting, after due preparation.
That last conference, Ike polled the Allied Chiefs of Staff, and not all wanted to go. That doesn't mean they were wrong.
In the end, it was Ike's call, after which he went back to his study, and wrote the following letter:
“Our landings have failed and I have withdrawn the troops. My decision to attack at this time and place was based on the best information available. The troops, the air and the Navy did all that bravery could do. If any blame or fault attaches to the attempt it is mine alone.”
It doesn't always work out seizing the initiative, but if one takes risk minimizing steps, in the end, it beats being Hamlet, who didn't act, and got everyone around him killed, himself included.