Would you consider Congress to be remiss if we didn't have standard weights and measures, interstate transportation systems, restrictions on state imposed trade barriers?
Not at all, but that's me. Some libertarians on this board wouldn't agree. Do you think we should have the FDA, the FAA, FTC, FCC? How far off-topic do you want to go?
Congress has the power to regulate commerce among the several states. It doesn't mean that Congress must use that power. It certainly doesn't mean that Congress is responsible for commerce as you suggest in your generalized (not "out of context") remark.