I'm sure they'll be tweaking visuals. When ARR released they would periodically do visual updates, biggest one I think was for the standard orange AOEs to be more clear at the time
considering they just did a huge graphical update they almost certainly will be taking another passthrough
On the flipside I also think sometimes they overdo it with visual effects. Thankfully, it's not as bad as a certain other MMO I've played *cough* Lost Ark *cough* but it does get annoying
A "simple effects" or "toned down effects" setting would be a welcome addition