SeventhCrow & YGirl both have it spot-on in their analysis of my intent. This is not about YOU, Cisare. You used your experience with a live-in situation as an analogy (I understand that it wasn't hypothetical, but it was still an analogy), and I expanded the analogy even further.
The "been there, done that" comment meant, as they have both already said, that I HAVE been in that situation, I HAVE experienced living with people who didn't communicate & let things build up until it became unfixable, and now I know better and I choose not to let my relationships get to that point again.
I also tend to use the word "you" in most of my analogies, not to point at a specific "you", but in the 2nd person literary sense. It's less formal than "one" or "someone" and last time I used my more objective, formal style, people thought I was mad. It seems no matter which way I phrase things, some people want to think that I'm making my comments all about *them*, when it has less to do with them and more to do with using a particular comment as a springboard to expand or illustrate my own ideas.
I could just break in here with no connection at all to anyone else's posts prior to my own, but I would think that would seem a little jarring and disconnected to those reading it. This is supposed to be a dialog, isn't it? Am I not allowed to hear what someone said, formulate an opinion on it or use it to lead into my own thoughts?
No, thinking that communication is the place to start for all relationship problems is not naive. What's naive is thinking that if a person has a deep insecurity or lacks communication skills, that making a rule about that person's behaviour will bypass any negative fallout that stems from that insecurity.
Of course people can have the best of intentions and still miscommunicate. But if you start with the idea that your partner loves you and wants the best for you, you are less likely to wander off into hurtful accusations and assumptions that your partner is willfully doing the wrong thing by you. SeventhCrow has it right - the solution to a miscommunication is not making a rule - that only stops the communication. The solution is more communication to clarify the original miscommunication.
I'll even give a personal example. I have a bad shoulder and a sleep disorder. When I lay in bed, I have to lay on my left side. I explain this every time I get a new partner where sharing sleeping space becomes part of the relationship. So, between my shoulder and my sleeping issues, sex is best for me during the day, not right when I get into bed.
Now, I had explained all this to my most recent ex-boyfriend. So we went for about a year with me getting into bed and turning on my left side, which, because of the side of the bed he preferred meant that I turned my back to him, and falling into an exhausted sleep late at night. I discovered later that he does not approach relationships from the point of view that his partners love him and want to do their best for the happiness of all involved. He thinks of relationships as a struggle (he uses the word "minefield" and "battlefield" constantly when discussing relationships). So, since he started with the assumption that I was not on his side, he took my turning to my left side as a sign that I was figuratively turning my back on him, that I did not love him, that I did not want to have sex with him, that I was merely tolerating him. He kept his suspicions silent for almost 2 years and then broke up with me over it 2 days before Christmas. I had absolutely no idea that my sleeping position bothered him at all, let alone as a break-up offense, and by the time I found out and explained - again - that it was because of my bad shoulder and I would be happy to switch sides of the bed if that'll make him feel better, he had already decided that I did not love him.
There are 2 problems here. 1) if he had started from the position that I did, in fact, love him and desire him, he would be less likely to jump to the conclusion that sleeping on my left indicated that I didn't want him and 2) if he had started to suspect this anyway, communicating his concern to me early on could have easily solved the problem. There are a million things I could have done to reassure him, from telling him, to making more of an effort to be affectionate earlier in the day, to switching sides of the bed. Passing a rule that said I had to sleep on my right side or have sex at night even when I'm tired would not have solved the problem since the problem was not actually that I slept on my side, it was that he did not assume the best of his partner and he did not communicate his needs and wants in a manner that allowed me to show him that I had his best interests at heart.
It has been said several times now by various people, including Ceoli, the OP, that we are not talking about personal boundaries for an existing relationship like "keep me updated" and "we should maintain our regular date night when you start dating someone new", we are talking about rules that an existing couple places on the behaviour of/with a new partner, possibly even a person who does not yet exist, such as "I don't want you to develop strong feelings for anyone else but me, so if you start dating someone new, you will be limited to the number of hours you spend with her even though you haven't met anyone yet and she isn't here to give her own input on how much time she wants to spend with you".