I think that's the wrong attitude, we should all be happy that are getting visas no matter the order. When they are doing these security checks, who knows what possible pitfalls there are. If they really wanted to be a pain about it and do FIFO, think of them stopping the process to make sure that each one is done in order, so everything there is an issue, it would delay the whole process, I'm glad they are simultaneously working on as many visas as they can.