Piper and Leo are the perfect example of what it is to be in love and how love can overcome all boundaries. It can also overlook the insignificant, almost minor detail that one of you is dead. The fact that he was dead wasn't even considered to be the immoral struggle, it was the fact that he was an angel and she was a witch and their work ethic could be compromised. Their WORK ETHIC. Regardless, they were made for one another and you're glad that all things worked out in the end. Now you just need to find someone who can orb and you're sorted.