There's a time when you are at a stop on a sunny hot day and the heat to your inner thighs is just crazy without the covers. I had them on my Tricolore, and when I bought the R without the covers it was very noticeable. I move around a bit to stop the concentrated heat to a particular spot to deal with it. I put them back on.
The Motoholdings has an open design compared to stock, so the side covers might do very little in preventing the heat from coming to you.