Cold, high-mountain lakes require long, hot, summer hikes. Those are horrid in waders. They're a bit less horrid if you carry your waders instead of wear them, but they're still horrid. That’s why I like wet wading season. I fish and hike in the same shoes. Likewise on clothes.
But wet wading season is shorter than vacation season so you’re bound to drag around your waders at some point. Patagonia knows this and they’re thinking of all you ounce-counting or gear-hoarding backpackers with their new Middle Fork Packable Waders.