Holy crap! Xpath 1 is still being used for it? I actually have no clue what the differences are between xpath versions but I just assumed everyone is on xpath 2

Holy crap! Xpath 1 is still being used for it? I actually have no clue what the differences are between xpath versions but I just assumed everyone is on xpath 2. I guess my other question is - have you run into any situations where the JavaScript parsing or browser rendering wasn't good enough?