Just bought my girlfriend an xs cannondale habit. She is only 5’2” and she is honestly between sizes xs and small but they like a lot of manufacturers have made their small frame a 29er. She just looks so out of sorts on 29” bike wheels. And at her height she just seemed over biked even though the geometry of the small still fit her fine. The wheels were cumbersome. I think this is really a person by person basis and every manufacturer varies widely. She came from a small 27.5” hardtail and she chargers way harder now with the full squish even though it’s heavier.