In the last couple of years, I have walked out of the house on many occasions without a firearm.
However, I can't imagine leaving the house for any length of time without a small flashlight, and I simply feel naked without some kind of pocket knife on me.
As others have said, a good flashlight comes in handy much more than a firearm (99% of the time). I use a flashlight every single day, especially now that it gets dark around 4:30pm. Walking to my car after work, checking our office warehouse doors, walking the dog, grilling outside, working on cars, etc.
I actually can't understand people who "suit up" each day with a firearm, perhaps extra magazines, knives, keys, wallet, phone, etc., and never consider carrying a decent flashlight. They must live somewhere that it never gets dark!
These days, for about $20-40, you can get a good (Maratac, iTP, Fenix) single AAA keychain flashlight that can easily outshine old incandescent monsters from 10 years ago. And they're the size of your pinky finger. For a few dollars more, you can move up into AA and CR123 lights from dozens of manufacturers that throw hundreds of lumens worth of light and are no bigger than a spare compact Glock magazine.
As others have warned, however, once you play around with some modern compact high-quality LED flashlights, you'll see what you've been missing and your wallet will immediately start getting lighter.