IMHO, it’s misguided to finally, after too many years, present a follow-up product to the Elk M1 Gold and not allowing it to be a drop-in replacement to the Elk M1 Gold.
Why should I be loyal to the Elk brand if a new Elk product is as incompatible to my Elk keypads and UPB light switches as other brands’ panels?
Why do you call UPB third-party when I have an ELK-M1PCSPIM, an Elk product that connects to the data bus?