The Zs are fixed black-box-strategies which are given to us since years, so shouldn't they all be obsolete by now?
Your question was asking about using an algorithm till death, so I was not talking about short term. Also, I was speaking in general, not necessarily about Z strategies.
oP group will keep a Z strategy alive so long as they deem it useful in today's market. Nonetheless, you should take it with a grain of salt and do your homework. Finally, the other comments about the cold blood index are useful.
