Blizzard has responded to some Holy Paladin feedback on the Dragonflight Alpha, discussing Blessing of Summer and a possible way to get fast Holy Light casts off.
why is Blessing of Summer not called something cooler and more in line with Paladin While this ability is relatively new to WoW as a whole, it does exist as a thing Paladin are familiar with, changing its name for the sake of change likely causes more confusion than a slightly off-themed ability does.