I think you completely misunderstood what I said. The race is 100m long. If you are just doing 30s, you are leaving 70% of the race untapped and untrained (likely detrained, actually). Even in the programs Charlie has shown as examples, that is substantial high intensity work to 60m after the earliest parts of the general prep and there is literally an exhaustive amount of low intensity work out to as long as 600m via extensive tempo. Charlie even said that Ben continued to do extensive tempo out to 300m even in his last years (the workout he mentioned was something like 10x300m with 100m walk around). If you are doing just a few reps of 30m and low volume tempo… it isn’t incredibly surprising you might not be in good shape (though walking for a few minutes shouldn’t be a problem).
If you are just doing a few 30s for a large portion of the year, you are going to be leaving a substantial portion of the race untrained. Your comments on coaching trees is quite erroneous to say the least, though Charlie has most certainly had an influence on many. I think you are neglecting what Bud Winters was doing decades before Charlie that has had substantial impact in Jamaica, along with the work of Tellez and othehrs.