To me it would seem just the opposite.
Picture this: You do say 4 decreases spaced around the work (2 land in front, 2 in back) every other row (with the other row being just purl). So, say you started with 40 stitches. It would take about 16 to 18 rows to get down to 4 or 8 stitches to draw together for the top.
But, if you did the same 40 stitches & did double the amount of decreases, (8 per decrease row), it would only take 8 to 10 rows to get to the top. Voila, a shorter, rounder top.
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