I wouldn't be so sure.
Once one gets to the point that one is just externally syncing #rwhod's files, it's not a great leap to realize that one might as well cut out the middle-man entirely: rsync (or whatever) the original utx.active files themselves, rather than have rwhod read them and chop off the fields at 8 characters, and just turn rwho into something that effectively runs who against a bunch of filenames.
ruptime is slightly trickier, but …