IIt almost seems like the game wants you to completely abandon the main story and make yur own story which I don't really like. I havent finished the game though so I don't know. I havent really seen the big picture yet.
I hate to say this, but if this is how you feel, Fallout might not be the game for you. Its an RPG. The whole point to make your own character, go anywhere, do anything. At the same time I'm confused. You say you are avoiding the main quest, but then say that you don't want to abandon the main story???? I don't know, maybe you could explain better?
But anyway, about some other stuff. No quest is trying to take you "out of the way" on purpose. I think that you may be thinking this because the main quest up to where you are all takes place in DC. However, the main quest is only a reallllly small part of the game. Just because stuff isn't in DC doesn't mean that the game is taking you out of the way for no reason. But even if you are only considering the main quest, later on it takes you to the opposite corner of the map multiple times, so don't be so sure that only DC matters.
And you'll never get Power Armor training unless you go about halfway- 2/3ish through the quest, so if that's something you are shooting for, you need to go farther into the main quest for sure. I'm open for any questions you may have.