maybe they mean you can't build buildings as you can not
it is about resource management and story narrative
with item crafting as a progression element

It's an inanimate object. He didn't call your daughter or your mother garbage. He's expressing his opinion on a video game. He can call the came a sack of uncircumcised penis smegma.. That's his opinion in the video game. When you insult him personally, that makes you the idiot. You may not like a movie I enjoy. Does it make sense for me to call you a cōck sucking, chode gobbling, ánal cavity licking goblin?

Yes because there is a difference between expressing your opinion on a game and personal insults.

Reading comprehension isn't your strong suit I see.

The structures and tools that the replicators can create allow for one to pretty easily assemble an extremely deadly projectile, if Subnautica were in the real world that is. So no, the adorably naive "uhhh we don't 3D print guns" thing doesn't make any sense at all.

No that was the reason literally stated by a Dev multiple times. He even stayed around as people ripped him a new one for it and repeatedly tried to justify it. He did it in threads on Steam, their own forums and even responded to articles covering it.
Here is the Game Director Charlie Cleveland's direct quote on the subject which started the whole stupid but funny deal.
"I haven’t read all the comments here, but I’ll chime in here, as I’m the main reason we don’t have violent/weapons in the game.
Subnautica was being birthed right around the time of the Sandy Hook shooting. This was a particularly nasty shooting, although many people don’t realize America has school shootings every day. Every. Single. Day.
Yet, for reasons I cannot understand, our people and the corporations that influence our country want to continue making it easy for people to get, carry and use pistols, semi-automatic and fully-automatic weapons.
I’ve never believed that video game violence creates more real-world violence. But I couldn’t just sit by and “add more guns” to the world either.
So Subnautica is one vote towards a world with less guns. A reminder that there is another way forward. One where we use non-violent and more creative solutions to solve our problems. One where we are not at the top of the food chain."
Also whether it makes the game more fun or not is a matter of opinion and the ingame reason given (which didn't come till a story update much later on) is frankly lacking if not straight stupid. Not having high power weapons in the survival blueprints because of a massacre is fine and would make sense ingame but not having basic tools for hunting and protection in a "survival kit" is just silly. About as silly as the fact you can make a knife, can make a metal pipe and have a welder but somehow can't figure out how to make a spear. Or how about how you can't make a gun but can make a torpedo launcher and lethal gas torpedoes (So guns bad but chemical weapons good I guess? lol).
Don't get me wrong. It was a very entertaining game and I enjoyed the atmosphere. However the reasons and logic behind the decision as stated specifically by the Dev himself was just pants on head retarded.

Or an alien. That babe's texts later on get more and more threatening.

You may be right.
Too much heroin and mephedrone.