This isn't just how happy couples argue; it's how happy PEOPLE argue.
You'll find just as much conflict in the workplace as you'll find with your family, and how that conflict is handled will determine how healthy your workplace environment is.
You can't agree on everything (and that's a good thing, because it keeps ideas fresh), but you MUST agree on how to talk about and resolve differences, how to communicate, and how to cooperate.
A great piece of advice I heard is "don't treat your partner worse than a stranger". Most people wouldn't dream of being abusive to a stranger they just met, yet they're fine with being abusive to the person they're supposed to care most about.
I understand the sentiment, but the way you avoid potential conflicts with strangers is to impose distance, which is not what you want in close relationships.
You'll offend your partner far more often than you would a stranger because you are intimate and vulnerable to each other, which makes it far more likely that you'll hurt each other unintentionally, but also far more likely that you'll have a full and meaningful relationship, provided you practice good relationship hygiene.
You'll find just as much conflict in the workplace as you'll find with your family, and how that conflict is handled will determine how healthy your workplace environment is.
You can't agree on everything (and that's a good thing, because it keeps ideas fresh), but you MUST agree on how to talk about and resolve differences, how to communicate, and how to cooperate.