Multiple detection only because the charge time on them is painfully slow. Ideally, you want enough so that you never have to move into an area of the dungeon without using detection on it first.
Treasure detection is nice for helping you to decide which way to go when you do have to explore a dungeon section without real detection, as there's no particular benefit in exploring an area with no loot to find. Once you have enough rods of detection that the recharge time is no longer an issue, you can drop and squelch treasure detection. Similarly for staves of detect evil, which will point out some but not all of the nasty monsters that are worth avoiding.
Treasure detection is nice for helping you to decide which way to go when you do have to explore a dungeon section without real detection, as there's no particular benefit in exploring an area with no loot to find. Once you have enough rods of detection that the recharge time is no longer an issue, you can drop and squelch treasure detection. Similarly for staves of detect evil, which will point out some but not all of the nasty monsters that are worth avoiding.
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