I don't think there's a simple answer to the below:
The Bucks were too big for the Celtics in the playoffs
Stevens had no answer for the lineups the Bucks trotted out...none.
I saw that too, but I will make a prediction about the Bucks right now--they will be too slow and tired come playoff time unless they make a big move.
Other than Giannis and Bledsoe, their top rotation players are all some of the most unathletic players at their position in the league at this point in their career--Korver, Middleton, Hill, Lopez brothers, Matthews, and Illyasova.
In my opinion, that means a few things: 1) few will be able to run the fast break with Giannis, limiting one of the best advantages Giannis has, 2) They will struggle to defend come playoff time, especially against sharp offenses, and 3) the way to beat them will be to put speed on the court, not size.
Imagine a lineup of Matthews-Korver-Middleton-Lopez-and Giannis trying to keep up with our playmaking wings, Kemba Walker, and Grant Williams. I also don't think that Brook Lopez can hurt teams inside offensively that much anymore, which means we can go small on him compromising our defense much.
I think the Bucks made their moves primarily with Philly in mind, knowing they needed size, but they might have forgotten about us in the process.
Philly, however, provides a unique challenge (to everyone in the NBA, not just the Cs).