the 2nd to last bullet where he says "undermine" doesnt sound reassuring for alts... A lot more things in WoW should be account wide or least a layer below on your main. E.g. if you're revered on main, you're 1/4 in honored of that faction, etc...
Yeah the holy priest niche of giving them a complicated button that most normal players will even notice anything happening when they press it. Will a normal player notice or even realize that their defensive is off cooldown? Does holy priest have to track every players cooldowns to use symbol of hope at the right time? This might help in mythic raiding, but does nothing to change the perception of holy priest in the content the majority of the player base engages in.