I have a question about resizing rings?

i would print out this page and take it to an actual jeweler and see what they have to say. but in my opinion is that any ring can be sized. the only thing that i know about when it comes to sizing is that my husband had to size his ring twice already and it made a part of the band thin and kept braking at that same spot. so what they did was put a half shank on it ( i am not for sure if that is the correct terms for it). anyway it made the band think in that spot and it has not broke since