I am not sure if there is more rejection rate to the case for spouse non-accompanying but what I understood from this forum and my agency consultant is that there will be some questions why spouse is not accompanying. If there are good and understandable reason then should be okay. Just needs more time to answer to the questions and more paper-work. But if a person put their spouse for non-accompanying with an aim to just increase their score, then should be a big problem.
That's incorrect. If your consultant told you this you should be careful with him/her.