That is a matter of taste and depends strongly on the respective writing instrument. Small models like the 114 Mozart or a Kaweco Sport need the posted cap for reasonable balance, while a 146 Solitaire with posted cap quickly becomes too heavy and unwieldy. With middle Meisterstücks like the 146, many switch depending on the situation. Anyone wishing to avoid cap impressions and polish effort on the body writes basically without the cap. A general rule does not exist.