The more I read up on duality the less I believe in it because of how "unnatural" it appears to a lot of types.

My question simply is....
When one or both types are unhealthy, can duality become as bad as a conflictor relationship?
It is hard to tell your dual partner if you are unhealthy?
How can you tell the difference immediately between dual/conflictor? I've also seen people confused on that and I feel like if it really were valid, wouldn't it be extremely easy to tell the difference?