It would be extremely helpful if the new smart layout functionality could be applied to groups only. Now it's necessary to create a symbol out of a group of objects I want to have the new smart layout applied to. This is not always desirable, as often its just an arbitrary collection of objects.
Example case: creating a submenu with submenu items. I can't say upfront how many items there will be in my submenu. But I do want the items to be pushed each other automatically horizontally with the help of smart layout. Having a group doing that would allow me to add the required number of submenu items inside that group. Now, I need to create a submenu symbol and predetermine a certain amount of submenu items. I can work around it, but it's unnecessarily complex.