It’s recommended to attack from weak stones, not from the strong ones. So the wording here may confuse.
Never heard that proverb myself before but ok. This glass house make me think of the specific situation where some of your stones are surrounded (by some other weak stones=glass house)
In that case, trying to break through by capturing these surrounding weak stones may not work well as you are yourself weaker.
I find it to be of limited use but still helpful to correct standard failure in the learning time.