Clarify why easier
See https://github.com/matrix-org/synapse/pull/13771#discussion_r968250300
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@@ -210,7 +210,8 @@ scoped, we can reduce the possibility of a hash collision. When scoping
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(`PRIMARY KEY (room_id, event_id)`) and lookups should be done through the pair
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`(room_id, event_id)`. Another benefit of scoping `event_ids` to the room is
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that it makes it very easy to find and clean up everything in a room when it
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needs to be purged.
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needs to be purged (no need to sub-`select` query or join from the `events`
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table).
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`event_id` global uniqueness has had a lot debate in places like
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https://github.com/matrix-org/matrix-spec-proposals/issues/2779 and
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