The desire for unity is nice. The idea that unity can come through doctrines is a failed idea. Its failed repeatedly. In the end people just have to learn to put up with each other.
Open interpretation is difficult to sustain. It takes energy to let other people have their opinions. The Bible Student Movement begins with that, but look what happens. I think you should have open interpretation but think that unity doesn't come from that.
You do have a true point in what you say.
Open interpretation is difficult to sustain. That is why one must have certain truths to be an anchor. After the reformation many groups formed believing that they could understand the truth on their own. It opened the way for one man claiming that he was sent by God. Then cults are formed. Such as the Anabaptist cult led by Jan Matthys and Jan van Lyden which led to the siege of Munster. You should check out Dan Carlin's podcast called Prophets of Doom which discusses them.