I’m looking at getting a 21 inch 4k iMac with 512 gb ssd and 16 gb of ram. I know only the 27 is upgradable so I want to spec it for what I anticipate. I’m not interested in a 27. It’s too big for my work space. But I do minor photo and video editing and wonder if 16gb will be enough. I’m not a professional editor by any means so by minor I mean minor family videos etc.