All of the ones you point to as examples of doing something right have something in common, their size restricts access. That doesn't hold true for many areas, nor is it a function of our "protecting" efforts. We wanted to "protect" Rainier from development so now we have 2,500-6,000 people up there everyday in the summer, we've had to build a literal shitload of infrastructure to handle it. You have to wait in line to get a pic in certain spots... we've created a gross nightmare of humanity in an area that we thought we were protecting. Nothing has been "protected." You have three other large volcano's here in the PNW that are just as easy to drive to and just as close to large metropolitan areas, but because we didn't try to protect them to the nth degree you can actually still enjoy them. Hell two of them have "corporate theme parks" aka ski resorts on them, and they're still wilder, they still remain truer to a natural landscape.
YNP may offer value to wildlife due to it's vast backcountry, but the main drivers were to protect the geologic features, which all have roads leading up to them, boardwalk around them, and parking lots full of cars circling to find a space. YNP is one of the worst places I've ever been because we "protected" the F out of it and in doing so killed it. I will never go back, I will never take my kids. Look at Canyonlands and Arches, spent two weeks this year hiking, floating, and backpacking around them. Arches in particular might as well be a corporate theme park. The wait to get into the park was 4 hrs, on a Tuesday, and that was "good"! Then once you do get in, you don't get to hike where you want, you get to hike where you can find a parking space, then you share a 4-10 foot wide gravel "trail" with 500 other people. I might as well have been in Walmart on Black Friday going down the clearance isle. There is no soul in Arches, and I can zoom out all I want in WY pic and still feel something of what is there or what was once there.
Those same "advocates" are the same ones doing the killing, they're the same surface shitting behind every bush at the trailhead, illegally parking along every access point, and pioneering trails across sensitive meadows, and hiking with a stereo playing. Our special places could use a helluva lot fewer of them than they have now.
Do we need sacrificial areas, yes. As Will said, we should be pushing for them because it keeps the areas we actually like less crowded. But what kind of hypocrisy is that? When we know our current version of "protecting" is actually closer to sacrificing but advocate it anyway because "it's not OUR special place"