Yes, specifically for Wrath of the Righteous, investing in ways to overcome SR is important and valuable. The vast majority of opponents have SR, and you will fight them both individually and en masse (e.g. army of dretches). My group is playing through WotR right now and our sorcerer has gotten a lot more punch out of investing in SR-defeating feats (Spell Penetration, Piercing Spell). Since the opponent list is packed with so many demons, it's safe and desirable to invest in things that are specifically effective against them - bypass DR, bypass SR, proc on evil foes only, etc.