There's a few considerations (which have already been hit on).
1. Boredom, if you don't want to do the workout you won't push yourself. If you're interested and excited you'll make more progress regardless of any other factors.
2. You'll adapt to rep ranges before actual exercises. Having some variation there is going to help keep the program from getting stagnant. At some point you'll need to change the exercise itself. Keeping in mind that changing the exercise can be as simple as changing your hand\wrist\foot position.
3. The bigger the exercise the less often a change will be necessary. You can keep doing standard compound lifts for some time before needing to make a change.
So the big question is "How do I know when I need to make a change?". The answer is "When you stop progressing." The biggest concern\idea is just like CSCS says, you need to consciously try to progress every single time you train. That doesn't mean add weight every time, every single lift. It means every single session your biggest priority lifts (your first 1\2 in your program) increase, more lbs\sets\reps. Progression is #1 and needs to be the goal of every session.
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