I wouldn't waste time trying to be nice; I'll turn up whatever if you'll have me. Cryptographically constrained room membership in Matrix is still stuck behind consolidating on matrix-rust-sdk for E2EE, so we only have to address & audit it in one place - and progress has also been impacted by funding challenges (https://matrix.org/blog/2022/12/25/the-matrix-holiday-update... etc). So you might have to wait a while longer.