Lord of the Wilds keystone affecting support gems with spirit cost

It says that only skills will have less 50% less reservation efficiency, it doesn't mention support gems.

50% less reservation efficiency for non-minion skills is already a lot, it really doesn't need to apply to support gems like Vitality as well.

Gems like Vitality add reservation to the supported spirit gem, they don't reserve spririt themself.

Overwhelming Presence linked to Vitality reserves 50 (30 + 20) spirit. 50% less efficiency would result in 100 spirit reserved.