Add proposal to remove score; reorganize

proposals/2414-optional-content-reporting-reason.md

@@ -1,19 +1,43 @@
-# MSC2414: Make `reason` optional for reporting content
+# MSC2414: Make `reason` and `score` optional for reporting content
+
+## Proposal
+This MSC proposes to remove the `required` flag for both the `reason` and `score`
+parameters, as well as the "may be blank" clause in the description of `reason`.
+
+## Rationale
+
+### `reason` Parameter
 
 Currently, the spec says that the `reason` parameter on the content reporting
 endpoint is required, but also says that the string "may be blank." This
 seems to be a contradiction.
 
-This MSC proposes that the `required` flag for this parameter be removed, as
-well as the "may be blank" clause in the description.
-
 Note that the kicking and banning endpoints already have optional `reason`
-parameters. The other endpoints mentioned in [#2367](https://github.com/matrix-org/matrix-doc/pull/2367) will also add
-optional `reason` parameters, so it seems that it would be more more consistent
-with the rest of the spec to make this optional as well.
+parameters. The other membership endpoints mentioned in
+[#2367][membership-endpoints] will also add optional `reason` parameters,
+so it seems that it would be more more consistent with the rest of the spec
+to make this optional as well.
+
+### `score` Parameter
+
+The spec also requires the `score` parameter, but its usefulness is limited.
+Offensiveness is difficult to measure, and is likely not going to be applied
+consistently across several rooms. Because of this ambiguity, it seems, many
+clients [simply hard-code the integer value][hard-code].
+
+To make this useful, for example, room administrators would need a way to map more
+specific values to the integer range and perhaps even instruct the client to
+display those mappings to the user. That may be possible to do in a closed
+client/homeserver implementation, but not generally across the Matrix protocol.
+
+Making `score` optional would enable this feature to be used in specific contexts
+while not forcing clients to support the ambiguity it brings.
 
 ## Backwards Compatibility
 
-Since servers currently expect this field to be sent by all clients, making
-this optional is a breaking change. Clients should send query the version of
-the homeserver to determine whether they can safely omit this field.
+Since servers currently expect these field to be sent by all clients, making
+theme optional is a breaking change. Clients should check the spec versions
+the homeserver supports to detect this change.
+
+[membership-endpoints]: https://github.com/matrix-org/matrix-doc/pull/2367
+[hard-code]: https://github.com/matrix-org/matrix-react-sdk/pull/3290/files#diff-551ca16d6a8ffb96888b337b5246402dR66