n0 > Anything which depends on the surrounding norms, is intrinsically subjective
First, implementation of all mitzvos bein adam l’havero are subjective to begin with – they depend on how the other person will be affected. What is honor for one, is a dishonor for another. So, this “subjective” is not a chiddush.
Maybe you mean “subjective” as a danger of deciding what to do on your own, with a great danger of rationalizing either kulos or chumros, whatever fits your current state of mind. This is, of course, a great danger and that is indeed why we often have often rules that limt our “creativity” – a bird belongs to the house if there are less than 50 amos, etc.
On a personal note, my nature is mostly to contradict norms, so you can rely on me when I call for following the norms 🙂 In most cases, when I bring the idea of following norms, it is either direct from the sources or something I heard form a Rav. I don’t tend to come up with chidushim calling for unity. I need to work more on that…