I guess I'm looking at the system I train in [goju-ryu karatedo] in a different way to you?
I don't see it in terms of 'beginners' techniques and 'advanced' techniques. Goju-ryu is a small bunch of ideas, concepts, call them what you want, that keep coming up again and again, over and over. The difference between a beginner and someone more advanced, is their ability to use these concepts [of movement, breathing, timing,distancing,etc] in such a way as to blend with the attack coming at you.
So, it's not the technique that's advanced or not, but the person's understanding who is using it.
I guess most people who can drive feel they could jump in a Formular 1 and win a Grand Prix, but the truth is most of us would kill ourselves if we tried. But it's all driving, so how come we can't do it? Well, we just don't have the mix of understanding and skill to pull it of. This is a bit like the student who has trained for just a few years, they have some knowledge [as most of us do about driving] but not enough to make things work at high speed with a calm sense of smoothness, which [I think] is a hallmark of both a F1 driver and an advanced Martial Artist.
As a foot note. I can't remember the last time my teachers taught me a 'new technique' or a 'new kata'. Though I've been given insights into better ways to use what I know countless times.
Regards,
Mike.