There was some discussion the last time it came up on HN [0]. The thought is it might also help prevent air bubbles. [0] https://news.ycombinator.com/item?id=2

There was some discussion the last time it came up on HN [0]. The thought is it might also help prevent air bubbles. [0] https://news.ycombinator.com/item?id=20079488 https://news.ycombinator.com/item?id=20079488