I applaud the author for pointing out the need for practicing forms from a self defense perspective, that the movements you learn in the forms are going to teach you useful techniques that can be applied in this manner. A lot of people forget this, that the main purpose of forms is for this reason, there are part of the fighting system you learn to teach you self defense.
I would take things a step father however.
Not only do you need to practice forms on your own, you need to actually practice these movements with a partner as well. This is a major step that most Tae Kwon Do schools miss. Once you've learned the movements, you need to go on to apply these movements via forms-based sparring with partners, where one person attacks just like your imaginary opponent in the form, and you respond with the same motion (or often, a very close motion) that is in the form. This step of the learning process is vital to actually be able to use these forms. If you don't ever get to this point, what's the reason to do the forms at all?
I agree completely. Some people complain when locks and throws are used in self defence because "that's not Taekwon-Do" [they need to read the encyclopedias], but even if you don't want to use those areas of the Art, the patterns are right there. What's simpler than Do-San #1&2?
that's simply an outward fist block and punch without step. I usually try to ask my instructor what a particular technique is used for and he usually demostrates them and they click in your head faster when you apply them. Some are still odd like "tai-gai" (please exscuse misspells)the outside-in crescent kick & arms up in a mt. block move 13-18 is still a bit weird and no one has explained it yet. Does anyone figure that one out?