Is there any disbenefit of using a Fibaro Double Switch over a Single Switch for 1 gang switches?

The context is I wish to take advantage of a bulk buy discount for a set of Fibaro Double Switches. This would mean that for 1 gang switches I would be using the Double Switches for the entire house.

Without knowing anymore (and hence my question), I would like to know if I could simply use the Double Switch for 1 gang switch and wire it up to one connector (S1) only, without having a redundant switch appearing in the hub interface?

Hope that makes sense. I’ve had a bit of a hunt for my answer around the web and came up empty. Thanks for your thoughts and feedback on this.