High-tension marching snares have an inner hoop where the batter head is placed to prevent its shells from collapsing—due to the high tension from Kevlar heads being tuned to higher pitches.
If this is the case, then why don't most marching snares have an inner hoop (or any form of reinforcement) on the snare side? Especially given that marching snare-side heads are also made of Kevlar.
I mentioned "most" since Dynasty DFX marching snares do have a reinforcement on the snare side—probably since it's not free-floating.