It was touched on in the post about the multiple individual different sweepers in an earlier post, but it is often the case that you might want multiple slightly different sideboard cards that all do similar things in certain matchups. Besides avoiding surgicals, some of them might be useful in some matchups but not in others, while others might be more better generally but useless in a few key matchups where that kind of effect is still useful, just because of the specific cards they are up against having defenses against that sort of thing or whatnot. Some of these could also be sideboard cards against other decks but less optimal or useless in some of the matchups that the kind of card is typically there for.
For instance, an anti-artifact section of a sideboard set of slots could have a mix of one copy each of Fragmentize, Kataki, War's Wage, Revoke Existence, and Stony Silence. Not all will be slotted in against the same decks or cards you might be facing, they all play slightly different roles and are good against slightly different decks, and not all might be sideboarded in against every deck with artifacts of note, but some might also be slotted in against non-artifact decks because, say, they are good against the enchantments in it for fragmentize and revoke, or because you are countering expected opponent sideboard cards that are typically artifacts against your deck.
Another example is someone might play their Relic of Progenitus from the sideboard out of a bunch of anti-graveyard cards of different sorts (perhaps including surgical extraction and Leyline of the Void), not because of hating on a graveyard, but because of it's card draw, against some deck that makes you want to do more card draw enough to use it in some fringe situations.
To that end, where it fits your deck, I'd see single copies of most of your sideboard cards being beneficial, even if you have multiple cards against a type of strategy you might be facing. This is less of a good plan if you really know the metagame you are facing and it's not very diverse, but in a highly diverse metagame, it might be a good idea.
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For instance, an anti-artifact section of a sideboard set of slots could have a mix of one copy each of Fragmentize, Kataki, War's Wage, Revoke Existence, and Stony Silence. Not all will be slotted in against the same decks or cards you might be facing, they all play slightly different roles and are good against slightly different decks, and not all might be sideboarded in against every deck with artifacts of note, but some might also be slotted in against non-artifact decks because, say, they are good against the enchantments in it for fragmentize and revoke, or because you are countering expected opponent sideboard cards that are typically artifacts against your deck.
Another example is someone might play their Relic of Progenitus from the sideboard out of a bunch of anti-graveyard cards of different sorts (perhaps including surgical extraction and Leyline of the Void), not because of hating on a graveyard, but because of it's card draw, against some deck that makes you want to do more card draw enough to use it in some fringe situations.
To that end, where it fits your deck, I'd see single copies of most of your sideboard cards being beneficial, even if you have multiple cards against a type of strategy you might be facing. This is less of a good plan if you really know the metagame you are facing and it's not very diverse, but in a highly diverse metagame, it might be a good idea.