The way I see it, sure it could have improvements but as it stands the developers are busy with other projects. Also, a chat filter is never going to be perfect as people will just find more bypass methods, same with there being a ton of false positives happening. Some words that shouldn't get filtered are filtered and so on. All in all, the chat filter isn't amazing right now but if people didn't break the chat rules, staff wouldn't have to punish for it.
-Jash