IFR pickup is never used because there is no need with current E base A085. IFR get DTI on other IFR and any observed VFR tfc and never get delayed for clearance into E. Why change a system that works ?
Bring E base down to A065 and there maybe more IFR pickups used and that means no seperation on climb just tfc info which is the same as now ! So why bother with it at all ?
Over complicates both pilot and ATC work procedures and adds operational risk for no benefit and I argue a far less safe system.