Yes and no. CHERI provides bounds safety but not lifetime safety. If you use capability enhanced garbage collection you can have both, but obviously bolting garbage collection on top of everything you're already doing with manual management (reference counting, etc.) in your existing C/C++ codebase is going to be the worst of both worlds.

Lifetime safety is a much harder problem to solve. Despite CHERI providing ""more robust"" bounds safety, the fact that you get decent lifetime safety for essentially free from MTE is a huge plus. The two technologies aren't incompatible so in theory you could bolt the two together to get MTE lifetime safety and CHERI bounds safety, but that would likely waste a ton of memory.