Strict aliasing is the only item on your list that I could see leading someone to get upset with the optimizer. And, maaaaaaybe signed integer overflow. With strict aliasing, I don't think your examples are correct. They all involve typecasting pointers, but don't involve interacting with the original type later. So, memcpy uses a void* as char* and MyAllocator uses char* as MyType*, but in both cases they never go back and expect predictible new values in the original types.

The rest are clearly taught in CS100 to be doorways to chaos. In particular, complaining that volatile doesn't get rid of the need for locks is just making noise. Might as well complain that auto doesn't get rid of the need for locks. They are both unrelated to threading.