It's not so much that people think Embiid will be healthy or not, it's just that this wasn't a deal we necessarily HAD to make, and by doing it with an EC team you are helping a potential opponent. If they had a slightly lesser offer with a Western team, it's easily arguable that that would have been preferable, because you're helping a team that you won't face in the playoffs until the Finals, and making the other conference more competitive with no impact on your own playoff seeding.