Dear Youdont,
It’s not about how much halacha you know. It’s your unwillingness to insist that the eruv be up to the the standards that you know are required. The ‘shrug’ = it’s a good eiruv I’ll see it whenever but until then go ahead and carry – is the crux of the problem. It is not a Torah approach to Shmiras haMitzvos. And it is what caused the downfall of Conservative Judaism.
I know that after a rav actually sees the eruv he is bombarded with issues by many who do not know what they are talking about. But that comes with the territory of being a rav. If your not interested, one (Or two!) can become a high end driver and drive the rav. That way when the rav is not around, the driver can play the role himself.