I'm accepting of holy spam, because it looks beautiful and makes a nice sound.
If you don't like it just disable effects and mute sounds that aren't coming from 'yourself' in the settings. Would be pretty logic to do that, wouldn't it?
Why do you want to force me to play in a way I don't enjoy? Why is it theoretically bothering you what skills other people use? Is it okay again if I use one emote between two holys, that is not spamming right?
You know that there are quests even for battle classes inside cities, with mostly dummies to attack, how do you want to differentiate or tell if somebody is spamming skills for a quest or not?
It's like saying I'm not allowed to wear shiny armor in cities, they make my pc lag and it reduces my enjoyment of the game if its just layers of gearanimation over each other, just wear casual armor in cities. You see how ridiculous that is ? People get banned for nothing serious and with their 3 strike policy to perm ban its a dangerous territory to handle stuff like that.