I’ll chime in here as well. I only have ONE of these in the house and it was a new construction and the result of a “flub” by my electricians part where he put a switch for a closet INSIDE the closet (facepalm). So I had him pull it out into another box, but rather than rip out drywall to put in a two gang box, they used this double switch. The top switch is for the room and the bottom for the closet which is near the door entry (it’s a small walkin).
That being said, in my previous house, I had a few of these in the same vein as @neminat and would have loved to have replaced them with something smart. I think there IS a market for this, granted it would not be nearly as great as traditional switches.
Maybe, if the market for the switch isn’t there, maybe you guys could look into something like the aeotec version, that could be smaller (if even possible) to fit in boxes as it seems if you have these types of switches, you likely have a crowded box too.
I dunno…I like the idea and think its needed in the HA space as it’s one of the only switches I see that don’t have a “smart” counterpart, but the market is not likely huge (but ill DEFINITELY take one if you make it )