That said, I offer this thought for other people out there: what comprises a system exactly? Is it just the rote forms? If all you practice is the form itself, are you still doing Chang Hon or Shotokan or Silat or whatever else?
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I think the question is phrased with a faulty premise, at least as applied to the Chang Hon system if all you practice a "rote forms."
(by rote, from memory, without thought of the meaning; in a mechanical way: to learn a language by rote. - Dictionary.com)
Patterns are made up of fundamental movements. You must first teach / learn the fundamental movements - specifications, parameters and application before learning the pattern/ Although not listed as #1 in the training secrets of TKD Gneral Choi would teach that knowing the purpose and application is the most important training secret.
The pattern volumes preface each pattern with new moves for that pattern with examples of the applications.
General Choi makes the analogy that the fundamental moves are the alphabet and patterns are the words or tactics. All the more fodder for those who like to link several moves to determine an alternate application.
Fundamental moves and patterns are 2 of the 5 elements of the Cycle of TKD, with the other 3 being sparring which includes all types 3,2,1, semi Free. model, Free, Self Defense, and Dallyon.
All the pre arranged sparrings use the same techniques mostly fopund in the patterns. Self defense has grappling techniques not found in patterns , and Free sparring has fundamental techniques highly modified from fundamental techniques.
So, Free sparring, grappling self defense, and Dallyon have little distinguishing characteristics as opposed to the fundamental techniques and how they are arranged in patterns.