When I say most of the one-steps I've seen are next to useless, I mean that their effectiveness relies on the attacker:
The effectiveness of any technique, regardless of any style, should fall not on the attacker, but the defender. Otherwise, what's the sense of even training.
- being a certain distance away before launching the attack
One should be able to adjust to all ranges of incoming attacks and if the training is well rounded, the defense against a long range punch can and should be used even if the attacker has grabbed you and is now attempting to punch. But the initial training for these has to start somewhere and opening up the distance is the starting point. It should'nt stay there though.
- shouting before attacking
There's a reason for this and though some may not agree, it was initially designed as to distract the defender. Just having that split second of distraction could be all that's needed to get the attack through to the target. If one trains to ignore such acts, then it won't be a surprise in the real world. Just about every fight I've witnessed opened up with a verbal assualt, then quickly followed by a physical attack.
- not driving forwards constantly
If the defender is doing the given technique(s) for the attack adequately, the attacker should not be driving forward at all. After all, the premise is to stop the attack asap and using your words, "and who will continue if you don't shut him down immediately."
- not repeating or retracting the attack
Again, refer to the above statement. If you are doing things right, the attacker should not be permitted to repeat the same attack and should not be able to retract(?).
- using certain standard attacks like lunge punches and front kicks that are never used in real fights
Just what is a lunge punch? I've seen guys jump in the air, at the defender and throw a punch. I've seen guys on a dead run throw the ever popular haymaker-roundhouse-hook punch. I've seen guys slide across the hood of a car and attempt to punch. Likewise, I've seen the front snap kick used by many in the street and they were not trained MA's for they did a lousy job of delivering the kick, but they tried. A front stomp kick is a favorite of street fighters. Different areas of the world seem to have different rules of engagement and perhaps your particular area, you do not see these applications applied, but here in the land of OZ, we see them.
Plus, there seems to be a trend for the defender using high kicks just because it's TKD, and TKD has to have high kicks.
Now this we agree on.