Not necessarily. As you said, it seems to happen to only select individuals. [Not that she would put the possibility past for all the rest, though, for there could have been many unconfirmed scenarios of the same outcome.

As Ai followed the purple alicorn inside the room that she had been leading her into, she looked around with a curious look on her face. She had noticed the door that they just went through before, but she had taken little to no note of it before, her attention usually caught by the front shelves of the library.]

This is cozy, Twilight-san... And even quieter than the rest of the library. I like it. [She also gave a smile upon noticing the pile of cushions.]