No, you did not miss anything, except maybe Paul’s comments in the thread you quoted.
Obviously when using multiple clients it is an issue with settings not being synced, and filters are a big one for me. I use three email clients, and none of them sync these kind of settings from the server, nor do they import them from each other. Server-side filters solve this problem, as then there is no need for duplicate filters on each device as it is done at the server before the message are even in your Inbox.
The only scenario where eM Client syncs these kind of things is in the re-branded version that works with IceWarp servers. Otherwise, for the rest of us . . . . . .