The purpose of this post is to rebalance Resolve and Perception, which both have lost important effects (Concentration and Interrupt) since PoE1, with unmodified attributes such as Might and Dexterity in a very simple way.
There are many ideas to improve Resolve, which was considered almost useless without Concentration modifier. Options include damage split to Str/Res, kind of shield against new Interrupt, negative duration modifier to afflictions, moving duration from Int to Res, etc. None has been thoroughly tested so far, while some of these seem to be overpowered or ambiguous. The new proposal is based on a different perspective, on the almost equally nerfed Perception.
Without Interrupt modifier, Perception affects only Accuracy and the related hit chance in combat. +1 Perception grants 2% additional DPS in a typical case (Accuracy = Deflection) plus maybe some extra Penetration, clearly inferior to Strength and Dexterity, which give 3%. The 2% DPS modifier comes from the 1.25% miss-to-crit conversion and 62.5% expected damage (50% hit and 25% graze), and slighly varies with different Accuracy to Deflection scenarios. This weakness of Perception has been hardly recognized and discussed so far.
The simplest solution would be equalizing the DPS effect of Perception/Accuracy with that of Might and Dexterity. Simple math results that Accuracy should be increased by +1.5 per Perception point instead of only +1. Since the combat effect of Resolve is the inverse of Perception, Deflection should be increased also by +1.5 per Resolve point. Res/Per/Dex/Might are mathematically equalized in a such simple way!
I can imagine that many players would still not be satisfied with Resolve giving just 50% more Deflection, but this feeling might be related to the fact that defensive playstyle is generally unattractive. The real question to my opinion is whether Resolve/Deflection is balanced to Constitution's +5% Health increment. However, this question has been already there in PoE1...