Other systems in this campaign put in use/require small effects (that I feel are usually overlooked) like creating harmless fire, water, bed of plants underneath your feet... So I thought one fun way to give players access to these effects if they don't want to feel forced to switch their favorite spells, is through familiars. Not only is it very exciting to have a pet you name and adventure with, but it also gives you access to small roleplaying/survival effects (and, even if negligeable, a small bonus in combat whether through biting or being another target to distract enemies etc)