What I'm more surprised by is that someone is confused by the concept of a "main engineer" or hull engineer shooting. Basically every ship with high firepower needs a hull engineer shooting. Spire top deck, mobula hull side, and galleon main engineer are all examples of this. If anything, it's a lot harder on those ships, and the engineer is punished more for not being on point. The mobulas hull is so much farther in compared to the 2 steps it takes on a junker. If you think your engineer won't know to stop shooting when taking too much damage then you should simply not take a ship with high firepower. If I have pubs on my ship I basically usually limit myself to goldfish or pyra. I used to have the patience for explaining everything but that was lost long ago. So really, I agree this setup could be bad for novice crew members, but to be honest I really doubt novice crew members would take or know what a "meta junker" is, or they would think it's a junker with two symmetrical gat mortar sides. Judging by this it's pretty fair to say it's usually not the best to compare pubs to doing things at the height of efficiency.