Right. So why do you decide and not the expert decide? So the expert can be smart enough to come with a solution but cannot "decide".

My point here is that once you become the manager, you should constrain yourself to the functionality (input/output spec), but you cannot decide on technical issues if you are not keeping up with the technology.

Because the technical truth is only part of the equation.

The right decision almost always boils down to a combination of experts, finances, end users, over all strategy, corporate culture and realism.

The variables variate in importance, but the one thing you can be consistently sure of, is that experts over value theirs.

On top of that, decision making is only a small part of management. The majority of it is spend on politics, motivation and issues/conflict resolution.