Since there are some misunderstandings mentioned in the OP about what people are infracted or banned for here, let me clear it up:
Constructive criticism is
a good thing. Criticism, constructive or otherwise, can be delivered in many ways. If you deliver your constructive criticism in a harmful, offensive, or toxic manner, this will result in a) a hard working forum moderator getting frustrated, b) you receiving an infraction, and c) adding to the general feeling of 'I really don't want to get involved on the forums', that many Paradox developers encounter at some point in their careers.
Then there's the purely strawman stuff, of which this user has handily provided me a perfect example:
genuinely surprised you put that much effort into researching naval ships and don't just make a mod for the game. The developers have clearly shown they will not invest time into stuff like this, navy is completely neglected, It's been 3 years since MTG and they've fixed and added literally nothing to it. And it's especially true with anything related to realism such as more accurate ship models you provided.
Who needs to hear from developers? T
heir intentions are clear based on [insert reason here].
This is something that plays into general misunderstandings about what
prioritization means to the gaming industry. Limited resources, limited timescales, and a need to
punch with development. Do we have time to fix everyone's pet issue immediately? No - and I make no apologies for that, because if we do, it is at the expense of something else, and not everyone values a feature or fix the same way as you.
Sometimes, it is easier to justify dealing with
many related things at once, instead of tackling them piecemeal. That usually involves finding an apt time spot in our
very packed release schedule in order to cover a system at large.
More often than not, I will stop replying to conversations after such posts, because once people start putting words in our mouths, there's really no point continuing to engage.
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All of this to say:
constructive criticism will not be punished. Bad manners will.