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On S3 Express, off/off (no prefetch at all) is surprisingly competitive for point queries because each sub-chunk range GET is only ~4ms. The gap between "no prefetch" and "optimal prefetch" is small (23% for point lookups) because individual GETs are cheap. On Tigris, the same query benefits much more from prefetch (up to 39% on idx-filter) because each wasted round trip costs 25ms.
Sometimes people want to get the last day of the month and fall into traps like this one, where they bump the month by one, but the days remain the same. Date does not constrain invalid calendar results back into a valid date. Instead, it silently rolls overflow into the next month.