This trade would have been pre Porzingis and Holiday. So it is hard to compare. People were pretty down on Brown at that point, down on White, and the narrative was that Tatum couldn't be the #1 on a title team. Our team for 2022-23 could have been:
Smart
Brogdon
Tatum
Durant
RWill
Bench: Horford, Hauser, Pritchard, GrantW, Kornet, Griffin
That is a really good team. Maybe with this team, we beat MIA and DEN. Probably not as good as the current team, though. But then say you still trade Smart for Porzingis and Brogdon+Williams for Holiday:
Holiday
? (Pritchard)
Tatum
Durant
Porzingis
Still a really good team, still not as good as the current team. I guess it is easy to say now that we are better for not doing this trade, but there were plenty of people, at the time, clamoring to get Durant.