if trees cant be smashed the game is probably broke.. large creatures such as dragons wouldent allow indestructible trees...
i dont expect some advanced physics engine where i can destroy a house stone by stone. i do expect some things to smash though!
glass bottles,plates (and potions) need to be smashable
urns and chests need to be smashable
furniture needs to be smashable
candles, lanterns and torches need to be destroyable
doors need to be smash able
skeletons need to be smash able
anything wood,hay or similar needs to be flammable
it would be fantastic to be able to burn houses. for both interior and exterior. imagine walking into a house and letting fire rip everywhere.. then getting outside and seeing the house in flames... then watching the flames stop to visit the burnt interior after
every material type needs to react at least to the point where they get overlays to every type of damage... so although that wooden door that leads to another cell cant be smashed it should at least look damaged