Most youngsters, I assume, would find this concept hard to understand. For them, it is difficult enough to master each sound and associate it with the given symbol. Adding the classification of Tenuah Gedolah and Tenuah Ketanah will surely burden them with extra baggage. My “Safek” is, is it really worth the extra pressure and anxiety to teach this concept to children at such a young age, when in all practicality is serves little in the way of their mastering Kriah?
In summation, my feeling is that this concept should not be taught at the time of Hascholas Kriah. I do not know if there is a Mesorah to teach it or not. (I did not learn it until after my Bar Mitzva.) I would appreciate to hear the opinions of