Other brand metal strap for moto 360 1st gen

A

AC Question

I have a clarification guys. I Bght a moto 360 1st gen recently. I wanted to change the strap of the watch to metal. So I went to a watch showroom like Casio and showed the watch. The guy in showroom told that its not good to use other brand straps with moto 360 because it might break the back door of the watch where it touches the watch. Is it true? Do I have to use only moto 360 band?