That mindset is exactly why the divorce rate is so damn high. The best relationships, and I mean the absolute best, have require a ridiculous amount of work. It’s not easy or natural to incorporate two lives into one seamlessly. It requires a multitude of misunderstandings and setbacks, of confusion and miscommunications, each one hopefully followed by some lesson learned.
Repeat that statement you made to any long term couple and you’d be laughed at.