Why would you choose to carry around a capped pen rather than a retractable pen? The only possible reason I can think of is so you never have to worry about the pen accidentally being clicked and stabbing you in the leg…or somewhere worse. I’d say the odds of losing the pen cap are just as good as the accidental leg stab. At least if a retractable pen gets clicked, it can always be clicked back; the only way to lose the retractability is to take the pen apart and remove the spring. If you lose a pen cap the pen is going to dry out and become unusable, but only after covering everything near it in ink. I guess they both have their advantages, so it’s up to you to weigh those advantages and the disadvantages and make the choice that best suits your needs and danger tolerance.