Fair comment. This may have been intentional, but we don't see it in the other careers, which is why Explorer screams 'dip class' to me.
Yeah, it may also go along with that "Generalist" theme a few people have been hitting -- dropping in seemingly random skill-enhancing talents as a way to "round out" the career skills. Honestly, I've not paid much attention to the Explorer career, so I could be on the wrong track entirely. The problems you're seeing in the Explorer career and its specializations may be why it is the subject of the first and so far only announced career splat.