You guys must have some cushy indoor jobs in climate controlled spaces, not have to move around much or perhaps don't keep the handgun on you all day long ... Or maybe your carry piece is wrapped in Saran Wrap? After a few days, I have to at least clean off the dust, dirt, lint, sometimes body oils or sweat that gets in the cracks, crevices and under the hammer ... And that's even during good weeks. 'Course, I'm outdoors mostly, and live in a somewhat wet environment, complete with the attendant mud, dirt, wet leaves and pine needles ...
You don't have to ... But some of us like to get in touch with the varying triggers and accuracy from pistol to pistol, even those exact same models. And every now and then, you notice little things that might need tweaking or replacing (springs come to mind) that just could lead to an ill-timed malfunction; once when I was issued the Beretta, I carried it for a month after a post-range cleaning, then when I went to shoot it again (at the range), found it wouldn't fire due to a broken part ... Just piece of mind, maybe, for some of us.