More Objects and Furniture

First of all it is difficult to create 3D models from scratch, if it wasn't everyone would be doing it and 3D modellers wouldn't make any money whatsoever.

But the point is it is not a matter of difficulty rather than a matter of priorities for the development of the game.

More features > more items, If the base game works with all its features then yes adding items will be far easier while if the game is lacking features and is full of bugs then there is no point in adding more items because noone will play it.