It's not the second inclusion that's a problem but the way any given template might behave completely differently depending on what order they're loaded in. Th

It's not the second inclusion that's a problem but the way any given template might behave completely differently depending on what order they're loaded in. That is, including a, b, c is not necessarily the same as a, c, b or b, a, c. This is not true with proper modules, they're order invariant, and as such you can make a ton of optimiztions.