Yeah, I definitely expect this to bite some people, if I'm understanding correctly. A plausible scenario (among many) would be: soft launch a site, show it to some early stakeholders, have Wayback archive everything via Always Online, fix embarrassing screwups or oversharing in soft-launched version, publicize site more broadly, everyone in the world can rewind to version zero, regrets. I don't think the existing warnings really make clear that a soft launch is now a forever launch.