Any structure is only as good as the foundation it sits on but once you have that, you can set about the task of developing the intricacies of crafting real skills with the future in mind.

Example:  Most guitar students are taught to practice the rested stroke first.  That's when you stroke a string and let the stroking finger come to "rest" on the next string.  It's an unfortunate but universal starting point.  The problem is that rested strokes account for only less than 5% of all right hand finger stoke technique when one plays music.

So by learning it in the beginning, you are actually training your fingers to become unresponsive because the free stroke is how most music is played.  Not allowing the right hand fingers to come to rest on adjacent strings as they hover in mid air is the "real" skill to learn if you want to play proficiently.

Just understanding this one thing will shave months of useless practice off your practicing and save you from having to painfully "unlearn" a false premise.