Cartridges AND a pump? Why?

i carry a frame mount pump (first coice) on my main bike. My winter bike I stuff a co2 cartridge and a inflator thingie into my bag, because I don't want to deal with moving the pump over and buying two pumps seems silly. But I much prefer the pump. The cartridges/head unit are heavy, bulky, and are a one-shot deal with no control over final psi. Plus, it's very possible to botch a tire repair such that the first inflation attempt fails. Pumps rule.