Somewhere along the way, management captured the meaning of "decision making" to such an extent that if you talk about making decisions in a company most people say: "Decision making is not our concern. It's management's.". This is a pity.
Everyone makes decisions. You decide what you wear, you decide what groceries to buy, and you decide to click or not on the Google Ads. Acknowledged or not, you do that every day.
And if you are a software engineer, you decide the way the system will look like by implementing a tree with a nice Composite Pattern, and you decide whether that functionality should be tested with one or more unite tests. These can appear to be small decisions, but they are decisions nevertheless. Sum them all up, add the actions that resulted, and you get the system.
The system you are working on is the result of all the decision making made in the past. If you are concerned about your system, you should be concerned with the decisions that shape its future.
Decision making is your concern.