Have you considered just putting the lights in the same group? If you can make your switches control the group you should be all set.

https://www.home-assistant.io/integrations/group/

You might also be able to link them together on the Z-Wave/Zigbee level, depending on your hardware.

Doesn’t take much to get death threats on the Internet, unfortunately. He probably would have received less of them with a better attitude, though. He wasn’t full-on Ulrich Drepper, but still pretty divisive.

It also didn’t help that Poettering isn’t particularly popular on a personal level. I think there would have been a lot less drama if he had better people skills.