so, we can say that B-Cell vaccines are good enough coz they have already been working on other types of viral infection, right?

They are likely good enough yes, presence of strong antibodies pretty much means there's no way the virus can outpace the immune response, and it often is neutralized so strongly you wouldn't even notice inoculation.

Well, it's good enough for some diseases. And it's clearly not good enough for some others.

Bear in mind that there are lots of viruses we don't have vaccines for, and not for want of trying.

I wonder how would they do it? I believe the system would depend on human input.