MSC3883: Fundamental state changes

proposals/3883-fundamental-state-changes.md

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+# MSC3883: Fundamental state changes (Draft)
+
+## Problems
+
+1. Room Joins:
+    Joining rooms takes very long. Over 10 minutes are required to join Matrix HQ.
+    A room has a lot of state associated with it. Most of it needs to be
+    transferred, validated and persisted.
+
+2. State resolution:
+    It can be very expensive. Split brained rooms are tolerated, so similar
+    state resolutions have to be done over and over again.
+
+3. State events:
+    Setting your avatar will send state events with that picture into all
+    joined rooms. If you picked a wrong picture on accident, you can't undo it.
+
+
+## Proposal
+
+- Only users with power level > 50 can send state events.
+
+- Memberships updates are coordinated using EDUs.
+    Each server is responsible for tracking kicks, bans etc. of its own users.
+    If a server abuses this, the server should be banned as a whole.
+
+- Displayname/Avatar updates should be EDUs that trigger a /profile query. While servers still fetch the picture, at least it is not in the timeline.