I have hiked a good number of the peaks on the list, mostly in NY. There are many so-called trailless peaks that have ATV trails nearly or all the way to the top. The only way I found out was by happening upon them and then following them. It had nothing to do with taking an easy way out, or getting "411" from some other hiker. A lot of these trails were on private land, or they came from some backyard where nobody would see where they came in.
The "46'rs" have their "history" with climbing the 46 original peaks, whether or not they met any of the criteria. There goal was to popularize more distant areas of the High Peaks, and then, conservation of the trampled peaks. I don't think we have any problem today with popularizing more distant areas.
I think with the 770 it should be kept quiet. If you want to do them, great. But the challenge lies in finding the peaks, getting maps, directions to the area, PERMISSION to hike, etc. Some of the list is out there, the Catskill list is in the back of the ADK guidebook (at least the old one with the bearded fella on the front), the New England list is out there too, I believe.(?)
I'll be the first to admit that I mostly lost interest in ever reaching even the Catskill 3000's. Mostly because of heinous briars in the western peaks and disinterest in pursuing lists. Ned is a big time quitter.
I agree with Swanson and E. Schlimmer about the litter that is involved with a lot of peakbagging. A mountain in Northern NH with no trail and barely any hiking pressure will still have a bit of litter on top in the form of a baby food jar with paper jammed in it. It's worse to bushwack up a TRAILLESS peak and find litter on it than one that you KNOW will have a clearing and possibly a little brown sign on it.