Blizzard has updated the class tuning going live tomorrow, noting that Holy Paladin’s Blessing of Summer will not be nerfed as much.
I’ve updated the OP to correct a typo.
Paladin
Holy
Blessing of Summer now causes attacks to deal 20% 25% additional damage as Holy (was 30%).
Full Notes
As we continue to monitor gameplay data and player feedback, we will soon make several tuning adjustments to classes that are over- and under-performing in group content.