‘Maybe I’ll move,’ she said, quietly, and Twilight shrugged.
‘No, probably not.’
‘I could. Moved around all the time as a filly. Always on the march.’ She sighed. ‘Don’t you ever want to just...I mean, there’s nothing tying us here, now. We could go up to Canterlot, or Manehattan, or Seaddle, if you want. We could go anywhere!’
‘We could,’ Twilight agreed. ‘But we have a nice house here.’
Smith nodded. ‘It is a nice house. We built it well.’ Outside, dawn breaking, light seeping through the curtains to illuminate the empty rooms. ‘It just doesn’t feel like home, anymore.’
and yeah, the Apple Family farmhouse would feel cold and empty with just two ponies in it. and given it's just Smith's direct descendants who live in it in the canon present, i guess this is the point where it is just her (and Twilight). inheriting an empty family house, there's just something to that.
and Smith's rootlessness as a filly is an interesting contrast to how we know she stayed in that same house for decades and decades of her life, now