Mixing Rep Ranges

I notice in your templates that you guys rarely mix rep ranges for a single exercise in a single session (apart from a heavy single at the start). That is to say, I usually see you program for strength something like 1@8, then 4@9, then 4@77%x3. I do not for instance often see, 1@8, then 3@9, then 5@75%x3. Is there a reason to keep the rep range consistent, or is this just plain old preference?

I don’t see a big difference between 5’s and 3’s and we do have that in some of our templates. Also things like 1 @ 8, 8 @ 9 and similar.