The only time I carry "camp" footwear is when I go to Europe where I stay in hostels and huts exclusively rather than camp. Many facilities, especially in the Alps, make you take your "boots" off before coming in, even if your "boots" are really trail runners. Some provide house slippers but sharing footwear is pretty gross in my opinion. So I carry flip flops in that situation. For backpacking in the U.S., I haven't carried camp shoes even on trips where I use hostels and public showers. For me the weight isn't worth it. I don't spend much time in camp anyway since I'm out there to hike, not camp, and most hostel shower floors are not that bad in my experience.