Are there any benefits from building decorations beside from the doghouse, because the watchdog will use it and so it can be placed strategically??

The game help text implies at least something adds happiness by being built but maddenigly wont say what

Two things i know for sure no squat are paintings and rugs. I've tested laying down a warehouse full of em, one type at a time, and zero effect on my happiness. Was stable, leveled off ~80 before zillion paintings, and same afterwards with days of waiting to see if it was slow effect.

Right now i just use the main big things that work for sure - excess food, water, and esp defense

Beds dont seem to matter if in excess, just matters if one less than minimum. Oh, wait - make sure to have 1 more bed for youself.

I noticed if i dont check and sleep in a bed assigned to someone already, even though i have 20 extra beds, the settlers will tell me there is a bed situation and people are sleeping in shifts. This only happens when i sleep on a green tagged bed (assigned), but never when checking i amsleeping on red tag (unassigned)