Re: What is an "advanced technique?"
I slightly disagree, I do know of "advanced techniques", though a more accurate naming would be "techniques for advanced practitioners": techniques which are actually simpler in nature yet require more accurate timing, better sense of harmony, better control over self, smoother movement etc. in order to succeed with slightly less cooperating partner.
Also know of variants of techniques which are being taught to beginners despite having "inherent weakness"/"holes", but are more safe for practice than the slightly modified "advanced form".
No great secrets here, very simple stuff.
Own experience has shown beginners often find the more complex / multi-stages techniques easier to implemnet, while single touch techniques are more difficult for them.