I've seen electricians [up until the ARC Fault code mandate anyway] source replacement breakers for 35 year old Cutler-Hamer panels to conduct single circuit repairs. I've also seen A/V techs unable to source replacement Classic RA parts for switches installed in 2007. Where "physical plant" product is concerned, the integration brands had better start thinking more like the utility brands in-so-far-as longevity, reliability and replaceability if they want to continue expanding their market share.