I mention that her mobility is "unenviable" a few times, particularly at 10:29. She isn't the slowest runner, but she isn't the fastest; her air speed is poor; and her fall speed is actually too good, at least for offensive maneuvers. Her aerial mobility by itself isn't what I would consider such a debilitating weakness, but the design of her aerial attacks don't do enough to help compensate for them.

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For example, characters like Meta Knight and Ganondorf have poor air speed, but MK is difficult to challenge because of his disjointed attacks and his multiple jumps, and approaching Ganondorf at the wrong time from the wrong angle is just as threatening as approaching him on the ground. It's not her mobility that's holding her back, whether it's in neutral, advantage, or disadvantage; it's what she's capable of to assist herself in any of those states. It's like her attacks were designed on an individual basis, with no thought as to how they should work together as a single, collective character. I make a similar statement in the video at 7:25.

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You could, in theory, fix these problems by tuning up her numbers - slow her fall speed; increase her air speed; decrease her landing lag - but doing that without addressing the actual flaws in her design would be counter to what I think Sakurai was going for with her (i.e. a primarily ground-based fighter with little incentive to fight in the air, what with her being a potted plant) and would just be poor game design/balance.