Winning a title in Cleveland is one of the singular greatest achievements in NBA history, and in American sports history.
In a lot of ways, it transcends the quantitative metrics we generally use to measure athletes' success.
LeBron will not control the Lakers from top to bottom, especially with an even more charismatic leader like Magic around. I think it's generally understood he went to LA in part to kick start his post playing career.
Both of which are to say, LeBron has his own goals, desires, and motivations for his decisions, which may sometimes go beyond just counting rings.
(Also, I'm still not ruling out Magic, LeBron, and the pull of LA leading to another title before LeBron retires.)