This is very simple;
The Task Manager is not written by GOD, it uses the same API and system calls. If the linux (android) kernel can't see the memory leak or a runaway thread, then 99% is that the task manager won't see it.
The task manger simply consumes more resources and slows the phone down.
A process can be running in the background using 0% CPU, what point is there killing it? By default apps are installed in RAM, so what difference does it make if they are running at 0% CPU??
How much "free" memory do you need, 100MB, 30MB?? if you have enough for the biggest app, that's all you need. If a thread is using CPU, in linux the system is re-niced to make it nicer to others, that is given lower priority. This is done by Linux you don't need to do it manually, but you can if you are root, a pointless exercise.
I have astro file manager, and it has a task manager, I launched it out of curiosity and it is just a nice geek tool, no use except for knowledge. The people who can't understand why they don't need a task manager, are the ones who will download one, use it and break their system and winge and cry, like the ones who complain their alarm has stopped etc
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