I would add another use for dual switches (dimmer & on/off) would be old or otherwise crowded multi-gang wall boxes. I frequently don’t have room to add smart switches to those multi-gang boxes because they are:1) old and a little shallow, 2) the boxes have too much wire/larger gauge wire (I’m loath to trim down wire in a box which would leave me with little future flexibility), or 3) the smart switches are just too darn big. I’ve even tried the micro switches (including the dual switch ones (without dimming options 
) but when you add the momentary switches into the mix you still are out of room. (Would love to have a dual decora style momentary switch - can’t seem to find them).
Keep up the great work and the responsiveness.
Cheers, John