I promised to do the other day, I'll mention the drawbacks of clipless pedals and the benefits of regular, old-fashioned, flat platform pedals. Basically, it boils down to a lack of flexibility in your footwear, and the inability to dab quickly where conditions might warrant.
My old MTB-style winter bike usually has platform pedals with PowerGrips. For deep snow and extreme muck commute conditions, it's easier for me to wear waterproof hiking boots with gaiters (when necessary). I have studded tires, but I still find it necessary to dab to stay upright on occasion.
It turns out I'll often take this platform-equipped bike for quick jaunts to the coffee shop or neighborhood park. I don't need to change into cycling shoes.
Sue, Kent and Jill cited these advantages of platform pedals, discussing the reasons for their personal preferences.
Photo info: blue shoes by enyahs.