The main reason why I would like to upgrade to at least 12GB is because I'm going to be installing a 256GB SSD as a boot drive. In doing so, I would like disable the swap file system. After doing research and reading a bit about doing that, I've read that doing so with 8GB or less memory is unstable and that 12GB is minimum and 16GB is recommended. Plus I figured the extra memory bandwidth couldn't hurt.
Also, when I was searching for the link of my computer, I noticed that it says expandable to 24GB. The Dell tech told me 12GB though so I'm not sure which to believe.