If I have to keep on a Canadian server, I'd like the game tuned to better understand that 200/300ms ping is not an exception but the average rate for a lot of players.

All endgame encounters are tuned, on some stages, on our ability to not being caught on a number of AoE of any kind. In the past the problem it was so evident that full groups of pro players were mercilessy wiped on encounters they know very well.