You don't think the sealed sender feature is an improvement at all? Nobody relies on it. But if we can make an attack 10 times more expensive (because we can't

You don't think the sealed sender feature is an improvement at all? Nobody relies on it. But if we can make an attack 10 times more expensive (because we can't prevent it completely), why not do it? Secure remote computation is better than nothing. I'd start having problem with it when people rely on it when there are better solutions, but that hasn't been the case so far, AFAICT.