The architects role involves many disciplines which he may only be throughly versed in a few. He will have general talking knowledge and some understanding of the other disciplins. That is why we have specialist like mechanical, electrical, civil, landscape, etc. The architects primary roles are coordinator, planner, administrator, and designer of function, aestetics, access and life safety. It takes a different breed of person to do these kind of tasks than it does for someone to produce pages of calucations and intricate details.
Few people have the temperment for both.
As for getting an architects license, only you can decide if that is right for you. I always planned to do so, and finally did. After a while it rubs off. The tests seemed more a test of endurance than depth of knowledge. You need to know a little bit about a lot of different things to pass these tests.