I've hardly touched a fountain pen since my primary school days, but I recall that regardless of brand of pen or ink, everyone found that if you left a pen with its lid off the nib would dry out in an annoying way.

Does modern ink (or nib technology?) prevent that being an issue, or does your retractable pen have some clever way to close the nib opening when it's retracted unlike a typical retractable biro/other pens?