Same here, but not just that. Many hentai artists struggle to draw realistic-looking breasts - of all sizes, but especially the huge ones. Magaki's characters look realistic in that such sizes and shapes are actually possible IRL, though rare (it's a medical condition called "breast hypertrophy", basically boobs growing to gargantuan proportions due to as of yet poorly understood reasons, but mostly linked to pregnancy, obesity or puberty).
Massive fap fuel for us perverts, but hardly enviable for women who have to deal with it as having such enormous assets comes with health and psychological issues and, of course, stigma from third parties.