> This means I don't have smart bulbs, but relays in the light switches

In my experience, many good smart bulbs have the option to act like dumb bulbs on regular light switches. Some just return to the state they were last in when power returns, others to a "default boring light". It's one of the things that keeps me buying the more expensive smart bulbs because they are easier to configure between such options (and the third option: stay off when power returns; avoid the "bright flash wakeup" in overnight power outages in bedroom lights, for instance).

You can also emulate that somewhat easily enough in software, even if the bulb doesn't support it right, if your hub notices a light disappeared from the network and then came back, it can default the light to some useful state.