Actually I think the real reason they don't exist is that a six meter wide twelve meter long (or whatever the numbers are) minigun just looked stupid. No other reason.
What you suggest does exist with missiles and needs to exist with more weapons.
That being said, I wouldn't be against the no-clip multi-cannon, if its spin up time was a third of a second longer.
i remember a quote about that, i think that was actually the real reason for it. a large multicannon would have looked stupid.
balance wouldnt be that hard, even our other 4 size weapons are not that much different from eachother, the biggest difference is the penetration value against larger ships. a size 1 cannon should have a hard time penetrating a conda, while a size 4 cannon doest that with ease, but still doesnt onehit a sidewinder.
edit: here is the dev update that describes the damage model
https://forums.frontier.co.uk/showthread.php?t=170205
So a small pulse laser (20) would deal full damage to a sidewinder (also 20), but less than a third damage to an anaconda (65). The main intent of this mechanic is not to penalise small ships, but to make large weapons effective against large ships without one-shotting smaller vessels - they don't actually do that much more flat damage than a small weapon but by piercing much better are far more effective against the harder target.
edit 2: wasnt it said that we will get a large multicannon this season?
also what about this?
https://forums.frontier.co.uk/showthread.php?t=130531&page=2&p=1999751#post1999751
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