[wuch]

(n+1)sec attempts to address the issue of transcript consistency, which is completely out of scope for megolm. Though, it puts additional requirements on the chart room, in particular "members of the chat room receive the same chat events in the same order". I wonder how well this works in practice; does XMPP chat rooms usually ensure this or not; what about flaky internet connection, etc.

[hvidgaard]

The protocol itself could implement an ITC, with deterministic rules for concurrent events, and thus have an identical ordering for all members. It would make sense to make this as an extra layer on top of the core protocol when using distribution mechanics that cannot guarantee ordering (which is most of them).