v2 onions being deprecated was announced long in advance so many sites managed their transfer by announced the new URL well in advance. I don't think anyone was really bothered.
Yeah, some sites told their users about their new v3 domain. But the web was entirely destroyed.
One might even see it as positive, because it forces maintenance. Anyone still linking to v2 addresses clearly is letting things rot. Nobody should ever assume that content available under a certain URL will be there forever, after all, even if the domain stays valid and existant.