WTH automatic template of buttons /scene controllers

so i have a Scene Controller like Remotec ZRC-90 and and nod on 4 button rubber outside thing …!
how come its so complicated to integrate?
zwave so should be standardised ,but there has to be a complicated automation made,
only one blueprint ive found for the remotec and that broke a few times ,
nothing for the Nod on
then there’s a load for a hue remote its only got 4 buttons and the last i tried broke as well