Well my Pluto is in 12th house and I didn't think I'd be coming back. But my tarot says otherwise.
I can relate to a lot of what you have wrote in your posts about dominating families and how you care for your Mum so in one way I would like you and your Mum to be released from dominating influences and at the same time, to reincarnate so you can live a life free from being dominated and experience freedom. Too much freedom from family responsibilities can go the other way though.
Ive read that difficult charts may show older souls or those who are more likely to become aware of the true nature thanks to the pain they have received which have caused them to learn about the spiritual side of life. Easy chart may be young souls.
Some charts that are difficult might also deserve another life so they can experience more joy although maybe joy can be found somewhere else other than Earth, if Earth is the learning ground. So for some people I would like to see them come back just so they can have more joy the next time. But it is also true that you don't know what lessons people are learning.
I will use a pop example of Kim Kardashian. I heard her say on the latest episode of her reality show when she got a puppy for her daughter and it happened to bark a lot and she said 'trust it to happen to me,' as if everything always goes wrong for her.
That was confusing at first because out of the majority of people on Earth, she should be one of the luckiest. Not only is she in one of the best countries for economic and comfort advantage, she also comes from a loving family and a family that is one of the most successful in America. On top of that, out of her whole family, she is the one who has been given the most love and attention and has become the princess of pop culture as well as in her family. When their Dad died, the brother got the sharp end of the deal because he lost out on a father figure, and didn't receive one from the step-dad for reasons which later became clear because the stepdad, Bruce Jenner, was a transsexual. So you can see the environment was made by circumstances to be best fit for females, and particulary the female who was the most beautiful and extroverted, Kim, so she could make the most money. The circumstances of this environment were created through the death of one parent and the ideals held by the remaining parent. Kim Kardashian has not escaped the Karma though, I believe she is facing her karma through her marriage with Kanye West, which is tumultuous.
Sorry for rambling with that example but it shows how we each have karma to face and there is no escape and that appearances or earthly values are a mask and not an indicator of spiritual growth.
A difficult chart will therefore have a lot of karma and only with spiritual awareness can we overcome this in the right way. The more I look, the more I see families related to karma and how the cycle repeats itself. Or it could be that one parent has such a dominating force that it starts a new load of generational karma, who knows how long cycles are repeated because we inevitably lose touch with our ancestors.
I don't even think understanding this concept is enough but is the start of the realisation that could take many lifetimes. Maye we are meant to simply escape our karma by recognizing it, stopping it and transforming ourselves this life. Then we carry on the knowledge in our next life, which will be possible with even the most difficult chart then. And so it is not what our charts show but how we choose to overcome it. Easy charts show less growth potential then.