Element X shines with large rooms - think joining rooms with 100+ active users and a lot of events to sync. Using multiple clients is not a problem either, I think I have at least 10 active sessions active with my current account. Element largely "just works" for my users with few grumbles, but that is definitely not the case for a lot of others here.

As for my stack, it hasn't changed much since this post: https://news.ycombinator.com/item?id=34784816