The goal is to find someone who shares (your) same values, wants the same things for the relationship that you do, naturally agrees with you on how to obtain those things, and last but not least there is a mutual depth of love and desire for one another.
It's possible to have loving and supportive parents but find yourself drawn to someone (who did not). Most likely their value system and views of relationships would be very different from your own.
Too often what happens next is someone will invest time and emotion trying "change" their mate. This leads to frustration on their part and resentment on the part of their mate.
Very few people walk around with their hand up in the air screaming: "I'm looking for someone to (change) me!" Most people want to be loved and accepted for who (they) are. One is better off finding a person who (already is) the kind of person they want to be with.
Having the (same values) is a major key to having a more harmonious relationship. There is no amount of "work" or "communication" that can overcome being with someone who does NOT want what you want.
"Never love anyone who treats you like you're ordinary."
- Oscar Wilde