Change the angle and you change the pattern and therefore you change the exercise and sequencing of muscle contraction. Just like a door on a hinge can break over time due to excessive wear and tear your joints and tissues are the same. It's called called pattern overload and will make you slow, unathletic and prone to injury. Remember the body has evolved to move in multiple planes, sagital (squatting), frontal (lateral raise) and transverse (twisting).
Pay attention to this in your program. If you are lacking one plane add it in. Get creative and have fun with it. Just be conscious of it and try not to go overboard. I am not telling you to go do single leg ipsilateral kettlebell rdl to press with a rotation.... You don;t have to kill all three planes in one movement. I'm just sayin...
When is the last time you did a side plank? Russian twist? Threw something? Side lunge? Rock climber pull ups? Bear crawled? Cable chop? SIngle arm/leg work? Back bend-ed? Full bodyweight workout? Danced?
Don't get stuck in a rut. Take a month to play with angles and movements and your body will thank you.
Yours in Fitness,