In the past, I think Tatum and Brown have played Simmons well as too. I know Horford was on him for a lot of our games against him last year, but Brown, Tatum, and even Baynes guarded him well.
It sounds like the Sixers got into rhythm in the third and figured out how to attack the Cs. It's an issue, undoubtedly, but one that we will only face versus a handful of teams. Also, it's one that CBS will figure out wrinkles for. No one gave us a chance against the Sixers a few years ago, but we beat them because CBS put Horford on Simmons, which was a different strategy at the time.
I'm more interested in seeing how they respond against the Raptors.