I can't speak for every agency here but for LA at least the large number of at grade LRT stops is pulling down the average, vs ST has a higher proportion of grade separated stations. Would love to see this data with at grade stops removed. 3 avg is high still but 2 for redundancy seems prudent.
During the presentation it was said partly due to a need to improve passenger flow but also partly because we have more elevated and underground stations
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ST has some of the deepest stations around.