I have a 4 season bike with the above mentioned IGH/drum brakes/fenders, the full fred monty. One thing about drops is that if you start to lose control of one end or the other of the bike your body isn't as well balanced to get a foot down as it would be if you were in a more upright position. In ice and snow I can tell a big difference between my townie bike and the trekking bike which is a drop to straight conversion on an old touring bike. And platform peddles for the above reasons also, last winter I had many reasons to need a foot down fast. Some of that may or may not have been due to my "skillz".

I'm sure I will get some heat for the above from the dedicated clipless and aero crowd, so your mileage may vary with your riding experience.