This actually works already with Siri (and as mentioned in a sibling comment with google Home as well). I just tried that for fun a few days ago and was surprised that it actually worked.
I wonder if the problem is that it doesn't understand what "the lights" is? It must depend on how you've tagged these things, right?
In the Phillips* Hue app at least, they have the idea of lights independently, but you can also group them into rooms and stuff like that. So the multiple bulbs in my floor lamp are in a "lamp" grouping but also a "living room" grouping. It all seems quite flexible.
What about something like "all lights" "living room lights" etc etc?
* Or rather, whoever bought that brand from Phillips
Does home have some label for that? Can you say turn of the floorstanding lamp and it works? If so that would indeed be very weird. I have a sleeping room in home and said it should turn of the light in the sleeping room in 5 minutes and it worked. May be it only works with rooms.
This actually works already with Siri (and as mentioned in a sibling comment with google Home as well). I just tried that for fun a few days ago and was surprised that it actually worked.