Also, I am not sure I would say that ikkyo is always available. Nor does hands up = ikkyo. Getting up hands to defend yourself is critical, but I am not sure I am going to call that a technique.
Nor did i say hands up = Ikkyo, like i wrote earlier, "raising your hands can indeed prevent your attacker from landing a second and third punch and help you create distance from him/her by landing a couple of punches of you own or by simply pushing them away". I will be more precise, i know this from my
As far as techniques go, Ikkyo is the fundamental technique and from my experience it's always available but it depends on the way it's trained and used.