A case can be made for exactly the opposite of you just said.
Make it
Danny Ainge has:
Obtained a first round choice for a coach that wanted to leave, and replaced him with probably the most appealing young coach in the league
Assembled a very young roster that won 48 games and that should improve next year even with no moves
Positioned the team with the most favorable contract situation in the league by far
In a league with insane inflation everywhere except with home grown rookies, obtained far and away the largest cache of first round draft choices in the league. This includes 3 consecutive Nets picks just as that franchise is undergoing a complete collapse and is the clear favorite for last place in the league.
Gotten us meetings with the league's free agent elite for the first time in decades
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It is fair to say that he now has to close the deal and organize what he has into a contender, but his performance in the last 3 years has been spectacular.