Immunities can be fun, if there are multiple ways to break or circumvent those immunities.
Rather than Sunder Charms, I’d prefer it if they just allowed all minus Resistance gear and skills to break Immunities.
Allow Cold Mastery to break Immunities. Let -Fire Resistance on equipment break fire Immunes, etc. That way there are multiple equipment choices that you can choose between. You are not limited to a single “must have” item like a Sunder charm
It’s not that I don’t support changes or ways to break Immunities. It’s that these charms are boring and lazy.