I think it's true. I've worn heels for work events and casual outings, and I find that anything above 3 inches starts to feel like a challenge. It's not about being uncomfortable per se, but more about how long I can stand or move in them without feeling like my feet are about to give out. I'd say 2-2.5 inches is my sweet spot—enough to add a little height and style, but not so much that I'm constantly adjusting or limping. It's all about balance, and for me, that balance is around that range.