I would say that this ability is very useful for the Noctifier in Onyx. Onyx has a terrible time with obvious be LTs. Could be super good in Onyx.
Anathematic Lt + Caliban CoC is where it's at. Too much E/M and other Isolation out there to bank on Mnemonica these days.
Tried this this weekend and it was both fun and surprisingly effective. Not sure if it is 100% necessary, but it does have some use.
I'd usually run a Caliban anyway, Engineer for the most part. CoC gets me unparalleled Lt Security and even gets to keep the D-Charges.