Now my new questions,
Is there any purpose to assigning a barracks to an individual? By this I mean the "a: Assign Room" command, not through the military.
Is there any use to sculpture gardens, zoos, well rooms or any other meeting areas since .42? I've made a few but I haven't noticed any positive thoughts or dwarves hanging around them like they use to.
To memory, individuals cannot claim barracks defined rooms as they are reserved explicitly for military. However some nobles get a kick (the king particularly) out of requesting that armour racks and and weapon racks be placed in their rooms. And its one way of raising value for a dwarf's room if you run out of ideas for furniture without going overboard.
Sculpture gardens still have a use in applying a additional x2 happiness modifier on furniture with the 'tastefully arranged' thoughts in leveling quality. Zoos (& glass aquariums for vermin fish caught in animal traps via 'capture live fish' or any kind of caught aquatic animal though the cage transferral behaviour is a bit bugged) rely a lot on the value of the cage in how its decorated in relevancy to the animals being exhibited. People who like sheep, will be happier if you put your spare sheep not for pasturing due to age or awaiting slaughter inside a cage (where they will be hand fed be warned so be prepared to dump out seeds, though you can burrow a animal caretaker over a particular pile to keep them from rummaging your crucial industries) for display and its a nicely made cage. (zombies are immortal and exhibit as regular animals in cages, so capturing reanimated animals for tourism is good)
Private statue gardens and zoos help deliver the most to your dwarves if the general public dont appreciate your art.
A lot of socializing does happen in the taverns and close proximity in little cloistered prayer sites, so dwarves without being explicitly bundled together all the time dont bond as much as they used to, though evidently they still get into arguements, chat etc. Overlapping your taverns with statue gardens and zoos will likely not work because of 'socialise' and 'worship' areas interfering as a activity, detracting from direct idling behaviour.