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> As for the second point, Matrix's ever-moving target of a protocol makes selecting a client or server that covers all of your needs a massive pain. Currently, Matrix's primary server software, Synapse (which is also at the base of the matrix.org server many people default to when joining the network), is violating the Matrix protocol, making it impossible to invite users to chat if they are on compliant Matrix servers.

could you expand on this in detail?

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This will be referring to enforcing MSC4311 (https://github.com/matrix-org/matrix-spec-proposals/pull/431...) stripped state validation. Synapse announced a 1 year compatibility window to avoid ecosystem fragemtnation: https://github.com/element-hq/synapse/issues/19943. However, due to MSC4311 not better outlining how to handle compatibility, another server implementation chose to enforce the MSC more rapidly, breaking compatibility with everyone who hadn't yet implemented the MSC - including Synapse, which hadn't actually implemented it yet. Speaking as the lead of the Matrix Spec Core Team, we should have handled this better. https://github.com/element-hq/synapse/pull/19723 is the Synapse implementation which is now in the process of landing.

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