Listened to a close situation in class E only a few weeks ago, where a VFR blasted straight through the approach path of an IFR doing an RNP approach at Avalon. VFR was listening to the wrong frequency so had no idea what was going on, was just aware they didn't need a clearance to transit the E area. The IFR had to discontinue the approach and try to visually identify the VFR traffic, none of it sounded very 'safe'. I think some of the ATS distance were as close as 2nm.