Celtics fan, focus on the roster construction:

Frontcourt Insurance: With Al and Kristaps gone, Giannis solves Boston’s long-term frontcourt needs.

The "Garnett" Effect: Trading for a generational, hyper-intense superstar often transforms a team's culture. Much like Kevin Garnett in 2008, Giannis brings a level of intensity and rim protection that could make the Celtics' defense historically great.

In almost any matchup (outside of maybe Jokic), Giannis is the best player on the floor. History shows that teams with the absolute best individual player have the highest chance at getting banner 19... of winning titles (Im disgusted as a lakers fan)

Bucks fans: You dont really need a crazy explanation but:

Gravity: Giannis creates more "gravity" than almost anyone. When he drives, he requires 3-4 defenders to collapse, creating wide-open looks for teammates like Jaylen Brown, Derrick White, and Payton Pritchard.