There's also systems like Loxone where you have to wire everything but it avoids a star-like system as you can connect switches and lights in a tree-like fashio

There's also systems like Loxone where you have to wire everything but it avoids a star-like system as you can connect switches and lights in a tree-like fashion (ie, to connect another node, find the nearest node already connected and wire to it, that dramatically reduces the amount of cables).