There are vendors who do just that, in various combinations. Hue uses non-wifi wired protocol and offline-first hub. Lacks failsafe though. A local vendor doe

There are vendors who do just that, in various combinations. Hue uses non-wifi wired protocol and offline-first hub. Lacks failsafe though. A local vendor does the above, but instead of "smart" lightbulbs, offers smart switches - which still operate as physical switches when directly used. But they don't have huge marketing or anything like that, they appear to mostly sell to integrators (with their gateway then being integrated into popular solutions like HomeKit etc.)