You can remove kontact and the rest of the pim suite safely if you wish. However, if you wish to remove akonadi itself, make sure you check the list of dependencies that will also be removed, if you need mariadb, kolab, qt5-quick1, or anything else in that list, make sure to unselect them in octopi before removing it.
Yep will look into that as why so many processes I do not use and they add up to about 80mb or so of ram. And not knowing how much in cpu resources? May not be much. But every eliminated process means cleaner smoother running with more free ram.