You make a very good point about the ping and not one that I had thought of before. That alone is a good reason to not have this sort of change.
I figured that even with ping delay, the server would register the button press and associate it to whatever skill the button would be at the time and thus it wouldn’t be an issue, but if that isn’t how it works then yeah, it could be problematic.
Although I personally do not think that the colour coding of the base skills would be an issue, I did say that if the designers thought it was needed, it wouldn’t be hard to just change the colours of the AoE skill buttons. I was taking into consideration that even though the change did not seem important to me it may be important to others and I addressed that issue.
As for Fan Dance, the reason I included it is because it follows the same decision logic as the other procs. If you have Fan Dance 3 up, you never use Fan Dance 1 or 2. 1 is ranged single target with 150 potency, 2 is AoE with 100, and 3 is ranged 200 on a single with an AoE of 100. In all situations, 3 is better than 1 or 2. Adding to that, if you use 1 of 2 when you have a proc of 3 you may waste the proc of 3 all together if you re-proc it which would lead to lost potential potency. It is because there isn’t a situation where using 1 or 2 is better than 3 if you have 3 that I suggested it being another roll in skill.
This is kinda moot now though if the ping issue exists.