To look at a model and come to the reasoned concclusion that the model in question doesn't apply to you is not "choosing to limit oneself". I very much agree with you that we should be open to new ideas and concepts, which means not limiting ourselves to thinking that there are only so many ways people can express love and/or caring. No model which classifies human reactions in a few categories can possibly be all-encompassing, and a model that is based on a specific culture is very clearly limited. Models are not perfect descriptions of reality and if we find them useful that's great, but if they are not useful to us personally, we shouldn't beat ourselves up and feel as if our experiences have no validity, just because they don't tally with what somebody else has experienced.