I thought dual was like... you get to most be like yourself naturally around the other person w/o having to be somebody else. That won't necessarily turn into 'omg I really love you!!!' romantic feelings, but... seems like a good enough breeding ground for them.

I think this is problematic as well, I've said this before but if you get to be too much like yourself- you're not challenged enough, and often the introverted dual will get stuck inside a period of unhealthy complacency. So there is a dark side to duality. The theory itself even says not to idealize them. But idk we are only human and humans idealize. =p