I will leave my thoughts... hopefully, I am off your ignore list at the moment...
Concepts are the important things to learn, once you understand the concepts, you can apply them anywhere you want. The problem is that it is very hard to learn and understand concepts. I can tell you to blend with your opponent, but you need to learn what that feels like, in order to even know if what you did was blending or not. Techniques are the tools used to teach concepts. It is convenient that these tools are also able to be used as very efficient applications of the concepts, once the concepts are learned. Its useful to realize that in some instances, the concept is spread across many techniques and in other instances one technique can cover multiple concepts.
Lets go for some real examples. Techniques first. We can do a lunge punch, a lead side punch, or a reverse punch. These can all be done low, middle or high. We can also do blocks: low, middle and high. Whats interesting is that these are all done in front stance. So, what are the concepts these cover? They are all done from front stance. One concept they are teaching is power generation. With the punches we learn how to generate power from the front stance, right down the center line. This power can be delivered low, middle or high. It can also be delivered with either hand. There are small variances that need to be made, to use either hand and to go to each level, but through the practice we learn how to make those variances and produce a lot of power from that stance, down our center line. That power can be used as a punch, or a push, or a throw or anything we want.
One of the first things we learn to use that power for, besides being a punch, is as a block. The power still goes through your center line, to make the block, only you are now using a different part of your arm. We are also delivering the power in a slightly different way... its usually not straight into the attack to meet force on force. The punching teaches us to put the power directly into the opponent, the blocks teach us to put the power into the opponents limb to effect his structure and balance. (to create the opening for the counter punch... mid block, reverse punch) This power is still being generated from the front stance.
When we block, we block to the side of the shoulder but no further. Yes, it wastes movement and leaves us open. But, we are currently talking about power generation in the front stance. When you extend your block outside the width of your shoulder, you start to lose power quickly. We learn that the front stance is great for generating a lot of power down the center line at all height levels. However, that power is only effective between your shoulders and most effective down the center line.
Put together, we learn how to direct power straight into your opponent and how to put different directions on that power, having different effects on your opponents structure. Additionally, we learn the area of effectiveness of the power generated in the front stance. Now, we should be able to do whatever we want with power, in the front stance, provided we keep our power application with in the "strike zone" defined by our shoulders. These applications can be punches and blocks... or shoves, grip breaks, throws, joint locks whatever. There are a million ways to use that power generated from the front stance.
As a side note, what if you need to use that power outside the "strike zone?" Thats why kata / forms practice turning. We turn to move the "strike zone" and we learn to integrate the turn with the power generated from the front stance. (lots of fun stuff here...)
So, that is one concept looked at from many techniques. Its not the only concept those techniques teach, but it was an easy one for this discussion. Now lets look at the lunge punch, also done in front stance. Another concept this teaches is the idea of one punch, one kill. Or, the other guy should be unable to continue after receiving our single technique. In doing the lunge punch, we are coordinating our entire body to deliver force into that punch. The body should be moving forward, driven from the legs, the body should be dropping to add our weight with everything tightening on impact. We have put the maximum amount of force possible into that attack. Now, we need to put the commitment into it at the same time. If you watch wrestling or judo, you will sometimes see someone going for a takedown or throw... they do everything "right" and it still does not happen, because they are not committed to that attempt. You will see other folks nail their takedowns and throws, sometimes entirely based on their commitment. Its the same commitment that is being talked about in the lunge punch. As you can see, that commitment can be used everywhere... and that concept is taught within the lunge punch technique. (along with other things)
To go further, use the same set of techniques but instead of looking at power look at balance, or structure, or speed or blending.... Or, take a different stance and all the things done in that stance and think about power generation again.