Like most humans, I’m a creature of habit. Admittedly, I’m most comfortable when I have an established routine.
For example, at the gym, 9.5 times out of 10, I pick the same locker. If it is occupied already, it annoys me. Why is that? I don’t know. It just does.
Same thing happens with the treadmill. Yes, my gym has more than one treadmill but I use the same treadmill every time. Not to mention the stationary bike, that particular spot in the stretching area, etc.
In my mind, once I’ve found a good thing or found something that works, there’s no reason to change it. Some people might find it boring, I find it comforting.