The nerf to the Obsessive Rituals — is it too severe?

The Witcher's overall defense relies on layers: evasion, armor, and the witch shield. This nerf doesn't only hit the evasion stat — it directly reduces the character's ability to survive large single hits (i.e., the "one-shot line"). Even factoring in the 15% boost from gear, the 50% less modifier still results in a net defense reduction of over 20%, compromising all defensive layers at once.