Yoshi stated during one of the Q&A sessions that they would monitor the situation and make changes as necessary. He also said that he expected it to settle down after the instances were removed.
Well, newsflash "IT HASN'T". Trains are still the same moving from server to server. The same shortsightedness was seen recently after the Ishgard Resto patch.
An easy way to fix this so everyone is happy would be to have to same rendering rules that apply to S ranks apply to A ranks as well. Simple fix but why aren't they willing to use it?