I am not hesitant. I only say OP_CAT because it is absurdly simple change to avoid arguments about complexity and security. I then say SAK because it does all the fraud proof things I need and it is actually finalised spec and code. GSR is just a vague promise at this point so I don't talk about it for that reason. I also think OP_CCV is a very good compact way to do what we would need to do in GSR with many opcodes. But whatever... Just give me something. Anything. Because until then we are stuck with BitVM.