App killer?

Until recently I used to be able to use Android Assistant to kill un-needed apps and so free up memory (and also preserve battery life, help phone run cooler, etc.). But recently -- not sure if it was after the OS update on the Idol 3 (6045I) or an update of Android Assistant itself -- the only process shown under the Processes tab is Android Assistant itself, so there is nothing to kill. The "quick boost" feature, which formerly seemed to close the same bunch of apps I would see listed under "Processes", now also seems to do nothing. I am thinking this is likely something to do with the phone's OS, as an app cleaner built into the 3rd-party launcher I'm using has a similarly changed behavior.

Anyone else observing this, and/or know of a solution that works, and/or know what might have changed with the most recent software update?