Holy priest right now is probably the best single target healer the game ever had. If you are a parse slave, you are going to think that Holy priest is bad. But, if you consider the value you bring in terms of death prevention. Just spam damage 80% of the time, use hymn and salvation when needed, and you got yourself a pretty useful healer. Comic ripple is nice for parsing, but having a placeable cheat death every minute is also huge for mythic raiding.
Next patch we have sanctify and serenity basically on a 30% reduced CD.
Most of the fights that I use this playstyle, I finish around 3/4k dps, removing around 10 seconds of the fights, or moving across damage breakpoints for progression more easily. That’s a lot of healing you don’t have to do.