When in the Dojang the goal when sparring is not to win or lose. The goal should be working on and learning to use those techniques that we are not good at.
In the Dojang you are not going to win a medal. In the Dojang you are not winninng money. In the Dojang you are not building any record. In the Dojang you are learning to get better over all.
If you are wasting you Dojang time worrying about winning or looking better than your opponent then you are wasting your time and I can assure you that you are not getting better.
I tell all my students that they should look bad and that they should get hit. Because it is in the Dojang that they need to be trying new things or techniques that they are not good at.
If you waste a training opportunity trying to beat your training partner then you have just lost when it counts. If you are sparring someone that is obviously not as good as you and you just use the same old techniques that you know you can score with easily, then what have you learned or gotten better at doing that you are not that great at doing.
Your mindset in the Dojang should always be what can I train today that I am not that good at. if your back kick is bad then you should be trying to set that up and use it. Get hit when trying it. Then you know you did it incorrectly. But that one time that you land it and you don't get hit you will gain great strides from that single technique.
Yes you still use what works for you but that is the time to work on and focus on what you are lacking in.
Just my take on it.