The outer tube houses a serial number and looks pretty, that's about it. The mount and endcaps screw into the core. If you get a baffle strike or shoot 45ACP through an Omega... SiCo can unscrew the old core, trash it, put in a new one... and you're on your way. No re-welding baffle stacks, no cut down a can and rethread, etc.
If it was a "feature" and not set with Rocksett or whatever they use from the factory, people would be all excited. Since it's not a "feature" in the users manual everyone panics. Think of it like a Sig P320. The FCG isn't held into the frame with roll pins and screws, it's just a takedown lever so you can easily swap it out. No different with the Hybrid/Omega... the tube is screwed on there and the baffle stack can be replaced easily. (no real significant structural support, that's not really the point of it--- as would be with something like a Specwar or Saker).
In theory, if SilencerCo came out with a core that was 10 dB more quiet, you could send in the Omega, toss in a new core, and be on your way in no time at all.