On the actual point of OP. I honestly couldn't disagree more. I see it is a big issue with many ships designs right now, that people place a bunch of cannons on top of eachother to make "super lasers". This is why I also avoid this, same with engine blocks. It's simply stupid to "stack" weapons like that. If you place a cannon behind anything, it should hit it, including another cannon. Now if you want a huge space gun that isn't just one layer of cannons , you should wait till the devs implement a huge place gun for you to place, or wait till we as users have the ability to make one ourselves.
@Kaptn Problem with that, is that a huge thing about blockade runner will be the ability to board a wreck of a larger ship in spacesuits and possible loot whatever valueable you may find inside. THis wouldnt work with if they despawned. Then again you do say less than 10.. so maybe, yea we'll 100% need a despawner for single blocks.. unless the devs can program it so they're not super heavy