Of course they're a target come the playoffs. The question is can they get enough stops to win games with their offense. I think that's possible thanks to the big men anchoring the defense.
It's not "ignore the small size" it's "don't ignore everything else." And I'm not just talking about the dynamics they add to an offense. The descending contract structures, the likelihood of multiple trade chips remaining, and the fact that this team's core will be almost entirely 25 or younger are considerations we should include in the equation. I'm not stressing playoff defense. Thibs can either figure that out or Rose'll have to make more moves. Having Mitchell, Brunson, RJ, Mitch, and hopefully Obi might not be a contender. But it's a core with a lot of time to develop, tweak, or build off.