I really don't think Soyeon is tomboyish, she is just mature. She talks and acts like a woman, not a girl. It is attractive because you feel like there would be very little drama or insecurity issues with her.
I really don't care if they got plastic surgery or not because they still look natural to me. How is it any different from changing your hair and teeth, which are so accepted? I think especially teeth, that is a major reworking that pretty much every celebrity gets and makes a big change of appearance, and yet nothing is said. I don't get the mixed principles about this sort of thing in the public attitude.