Yes, it's unfortunate that two somewhat different fields have such similar sounding names. "Decision Theory" (or "Decision Science") vs "Decision Procedures" (or "Decision Problems"). But what can one do?
If only there was a framework for making choices about actions.
I'd say you would not confuse the State Administration and the Department of Mathematics...
Tbf in a lot of cases you can use decision problems to solve, say, optimization problems with only polynomial slowdown. Hence their appeal.