Over the years I've come to the conclusion that the lawyers are very confident in their legal opinions, but they are still just opinions that other lawyers are confident are the other way. My guess is some lawyer at firm A will say "oh we can't just do that, I'm sure we can't" while another lawyer in firm B presented with the same initiative will go "yeah we can totally do that, no problem at all, I'm sure we can".

Which lawyer you get seems to be a sort of dice roll that perhaps one could understand if one were a lawyer.