I also really liked the Keypad links (both 6 and 8 button). Probably one of the main reasons I stayed with Insteon, nobody else makes anything quite the same. I also really liked the Micro switches. Super handy for that weird 3 way switch that didn't really need another switch. Or in my current house a way to add control to my attic light (which is just a pull switch outlet) that I keep forgetting on when I close the stairs. Rather than having to run Romex down to a new or existing switch, just link it to the 8 button keypad that's already at the bottom of the stairs.
I think that is/was the main draw to Insteon, it was easy.
Really the only problem with Insteon as a company was really bad management. They tried to be the Apple of home automation, and that just doesn't work. It may have worked 20/30 years ago locking people into one ecosystem, but it's just not sustainable today.
I know EVERYONE has put in their 2 cents and requests to Mike but probably the best business solution would be for say UD to get the patents, licenses, IP and what not, and licenses some 3rd party manufacture to make the controllers (shelly for instance). UD get's the software control/integration part and someone else can make/improve/update the hardware side, name it whatever they want. I'm not tied to a name. Especially since UD doesn't want the hassle of dealing with hardware.