Always. Between my traditional EDCs, my Cybertool 29, my main EDC, my secondary EDC, and the Leatherman Squirt PS4 on my keychain and Charge TTi in my backpack, I usually have the following types of blades:
Medium sized plain edge. (sometimes 2)
Medium and/or Large serrated edge.
Small plain edge (x2)
Very small plain edge (pen blade x2)
Small or large straight edge
Medium hawkbill
Plus just about every other tool you might need in regular daily life (pliers, scissors, files, screwdrivers, TORX/allenhead bits of all sizes, caplifters, etc). Listing everything might seem like a heavy loadout, but it's not. That's why I love traditional knives like stockmans or congresses. It's very easy to get 2-4 very different, and all very useful blades in a very small package.
About the only blade style I don't have is the car door stabbing sharpened prybar.