Well, HUDs are amazingly helpful in any circumstance including tournaments of all sorts...but only if used properly. Many people look at the stats as the rock solid truth but in reality (unless you happen to have hundreds of hands on your opponent) they should be used to help in developing a greater ability to guess, estimate, and predict.
Even in a mtt having a hud is valuable. if we have been on the same table for more than five rounds or so, which happens often especially in the later stages of tournaments, the stats will help create reads...not saying the stats will give you a definite read...but it'll get you closer than without them. Add in any hands we've seen our opponents play and we build a better read. sharkscope
your opponents and now you're even closer to a definite read.
Information piles on top of itself, every little but helps. There is a such thing as information overload, so minimizing the stats on the hud is helpful.