Asai Sensei's 'fundamental open hand blocks' on assistant Andre Bertel

It goes without saying that you are right. However, the purpose of the oizuki is nothing more than a large scale linear attack which cleanly 'shows' the specific techniques being taught (or about to be taught).

Beyond the initial 'learning' phase of techniques, they then must be practiced in a realistic context if one is to include them in their repetoire.

Such demonstrations in seminars etc are for the cleanest display of the techniques being worked on. Nothing more! All the best!

i dissagree respectfully : )
how many people outside a chippy train karate to its rightfully high effectivness.
oi tsuki in a practical situation may have a smaller lunge and the arm could be snapped out at speed and retracted to devestating effect.
if some has this technique down to second nature potential is huge
or are u talking about the defence?
if so to me it seems that could be used against many attacks not just linear punching : )

It's a chasing technique. Funakoshi himself described it so.

what do u mean by chasing?

My understanding from Karate-do Nyumon is that it is intended as a pursuing technique; i.e. delivered against someone retreating.

Also, I really enjoyed your last article about the element katas.