Have you wandered how is your memory doing? It is not just about memory size. There is much more on memory than you can image. Check it out!
Before, I would only care for total memory and available memory. On android, just like on linux, there is much more on memory then what we are used to see on windows for instance. There is cache memory, Buffers, Active, Inactive and so on.
It is always good to know. It can be very handy for advanced users as well.