Is the vosotros form really optional (or useless) if I plan to use my Spanish for something other than just conversing with people from Latin America? For example, I'm considering taking the DELE exam at some point in the future, is it required for that? I suppose if I study Spanish at the graduate level, I'll be expected to know it? Is it used regularly in Spain or less commonly?
I'm sorry if this question seems ridiculous. All I've been told by the native speakers I have spoken with and taken classes from is that the vosotros is useless and there is no reason to pay attention to it, but there has to be a reason that it's in all my Spanish texts.