It's another variable. I think anyone should use the same bow for long enough to get used to it before they do anything important with it, like hunt or enter a tournament, because there are other, unavoidable variables between different bows and arrows. I don't think .5" is going to make much difference, so you should be fine.
I'm sure there are things you could do other than cut .5" off to get the arrows to tune perfectly. Personally, I'd rather do one of these other things and keep all my arrows the same length, but this is a fairly minor preference.